Triangle calculator

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Triangle calculator

Many kids hate geometry in school as kids find it uninteresting to study this chapter in Mathematics. Seldom mathematics itself is boring for many.
Geometry is used in different parameters of life including art, architecture, in building temples, palaces, dams, and bridges as this concept is mainly used in construction and measurement. This Geometry has now been employed in the field of designing, computer graphics, typography, engineering, and even in biochemical modeling.
While most topics offer something that kids can connect with and/or find intriguing, some children may find geometry to be cognitively challenging. In addition to not understanding it, they frequently fail to recognize the importance of learning

Triangle Calculator

The main problems for students to struggle with geometry are that

They are unable to comprehend the issue and use the terminology to solve it.

They are unable to observe or identify every component of the geometry puzzle.

They have trouble with the algebraic skills required for geometry, which indicates that some of their knowledge from the previous year has been forgotten.

This geometry is introduced right in middle school so that students can formulate the geometric proof and they get to know the study of plane figures, right triangles, trigonometry, and circles as this gives students geometric experiences.

Triangle basics of Geometry

Triangles are important theoretically, but they are also essential to how we design both real-world and virtual settings. Triangles are unique because they are incredibly robust. Only a triangle is stiff among all the two-dimensional structures we can construct with straight metal struts.

Triangle is the most basic concept in geometry and we have a Triangle calculator just to ease your calculation based on the concepts that we have listed below.

What is a triangle?

Any polygon with three vertices is called a triangle. A triangle has three vertices that are connected by three edge-designated line segments at the point where two or more curves, lines, or edges intersect. Generally, the vertices of a triangle are used as references.

As a result, the symbol for a triangle with the vertices a, b, and c is usually written as Δ ABC. In addition, the length of the sides and the internal angles of triangles are frequently used to describe them.

For E.g

An equilateral triangle is one in which all three sides are equal in length.
But an isosceles triangle is one in which just two sides are equal in length.
When a triangle's sides are not all of the same lengths, it is said to be a scalene.

How are sides in a triangle represented?

Tick marks can represent the length of a side on a triangle's edge; an equal number of tick marks indicates an equal length.

The internal angles of a triangle are denoted similarly, with varying numbers of concentric arcs placed at the triangle's vertices.

It makes logical sense that an equilateral triangle has three equal internal angles and three equal-length sides since, as seen from the triangles above, a triangle's length and internal angles are directly related. Although the triangle supplied in the calculator appears to be equilateral and has angle markings that are normally read as equal, it is only a representation and not necessarily equilateral.

Right or oblique triangles are those whose interior angles fall into one of two types.

Two line segments forming a square at the vertex, representing the right angle, are used to represent a right triangle, a triangle in which one of the angles is 90 degrees. The hypotenuse, or longest edge of a right triangle, is the side that faces away from the right angle.

Oblique triangles, which can be either obtuse or acute, are any triangles that are not right triangles. As shown below, an acute triangle has all of its angles less than 90° but an obtuse triangle has one angle higher than 90°.


A triangle cannot have more than one vertex with an internal angle greater than or equal to 90 degrees; otherwise, it ceases to be a triangle.

While the exterior angles of a triangle are equal to the sum of the two interior angles that are not adjacent to it, the interior angles of a triangle always add up to 180° By deducting the angle of the target vertex from 180°, one can also determine a triangle's exterior angle.

Any two triangle sides' lengths added together will always be longer than the third side's length.

Pythagorean Theorem

This theorem was introduced by a teacher and philosopher who found that in a right angle triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides:


For E.g:

It is given that ab=6 cm, bc=8 cm, find x

According to the Pythagorean theorem

Base2 + Perpendicular2 Hypotenuse2
(ab)2+(bc)2 = (ca)2
82+ 62+=x2
64+36 = x2
As per Pythagorean theorem, x=10 Cm

Area of a triangle

The following formula lets you determine a triangle's area: 

Area = 1/2 * b * h(Breath and Height)

To find the height of a triangle, draw a line segment from the vertex across from the base to a point on the base that forms a perpendicular. To determine the triangle's height, measure the length of this line segment. The base is any one of the triangle's sides.


For example, if the triangle's base is 5cm and its height is 8 cm, the area is computed as follows:

Area = 1/2 * 5 * 8

     = 20 square units.

 Area of a Triangle Using Heron's Formula

Heron's formula allows us to calculate the area of a triangle using only the lengths of its three sides without knowing the height. The formula is as follows:

Area = √(s(s-a)(s-b)(s-c))

where s is the semi-perimeter of the triangle, given by s = (a + b + c)/2, and a, b, and c denotes triangle lengths 


Consider a triangle with side lengths ab = 3 cm, bc = 4 cm, and ca = 5 cm. The area of the triangle can be calculated as follows:

s = (3 + 4 + 5)/2 = 6

Area = √(6(6-3)(6-4)(6-5))

         = 6 square units.

Medians, Inradius, and Circumradius


A triangle's median refers to a line segment that connects a vertex to the middle of the opposite side. The formulas for the medians ma, mb, and mc, in terms of the sides of the triangle ABC, are as follows:

ma = √(2b^2 + 2c^2 - a^2)/4

mb = √(2a^2 + 2c^2 - b^2)/4

mc = √(2a^2 + 2b^2 - c^2)/4


Its inradius is the diameter of the biggest circle that can fit within a triangle. It can be calculated using below formula:

Inradius = Area / s

where s is the semi-perimeter of the triangle.


The circumradius of a triangle refers to the circle's radius that passes through all the triangle's vertices. The circumradius can be calculated using the given formula:

Circumradius = a / (2sin(A))

The side length of the triangle is denoted by the letter "a," and A is the angle opposite side a.

Law of Sines:

The Law of Sines is a useful formula for finding unknown angles and sides of a triangle. According to the theorem, the ratio of the sine of any angle to the length of the opposite side is constant for all sides and angles in a triangle ABC.

a/sin(A) = b/sin(B) = c/sin(C)

Law of Cosines:

The Law of Cosines is another useful formula for triangles. This formula establishes a direct connection between the cosine of an angle in a triangle and the respective lengths of its sides.

a^2 = b^2 + c^2 - 2bc cos(A)

b^2 = a^2 + c^2 - 2ac cos(B)

c^2 = a^2 + b^2 - 2ab cos(C)

Other Triangle Formulas:

- Perimeter of a triangle: P = a + b + c

- Semi-perimeter of a triangle: s = (a + b + c)/2

 Radius of the inscribed circle in a triangle: r = √[(s-a)(s-b)(s-c)/s]

- Radius of the circumscribed circle around a triangle: R = ABC / (4Area)

Triangle Calculator:

A triangle calculator can help with various triangle calculations, such as finding angles, sides, area, perimeter, etc. It requires the input of three data points, which can be either the coordinates of the vertices or the lengths of the sides.

Remember, understanding and applying these formulas can be helpful in various real-life applications and enhance your knowledge of geometry.

Effortlessly solve complex triangle problems and explore the fascinating world of geometry with the versatile Triangle Calculator from


Q. What is the sum of all three sides of a triangle?

A. The sum of a triangle's three sides is called a perimeter.

Q. Can a triangle with three angles be solved?

A. When we know a triangle's three angles but not its sides, we say it's "AAA." Other solutions to AAA triangles are unattainable because there is no size information available.

Q. What is the AAA rule in maths?

A. A triangle is said to be comparable to another triangle if any two of its three angles are equal to any two of its three angles.

Q. Does AAS exist?

A. This theorem states that if two angles and any side of one triangle are congruent to two angles and any side of another triangle, the triangles are congruent.

Q. What is the rule of 4 in math?

A. Mathematics should be presented in four ways, geometrically, numerically, analytically, and verbally.

Q. What are an equilateral triangle and scalene triangle?

A. An equilateral triangle is one in which all sides are equal, whereas a scalene triangle is one in which none are equal. Therefore, an equilateral triangle is an isosceles triangle with equal sides and angles on all three of its faces.