Inscribed Circle Radius of Isosceles Triangle Calculator

An online calculator to find the Inscribed circle radius. Inscribed circle is the largest circle that fits inside the triangle touching the three sides. It is also known as Incircle. An Isosceles triangle has an inscribed circle with radius R. Use this simple online Inscribed Circle Radius of Isosceles Triangle Calculator to calculate the radius of inscribed circle drawn inside a triangle with the known values of base length and side length.

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Formula:

Inscribed Circle Radius = b√((2a - b) / (2a + b)) / 2 Where, a = Side Length of Isosceles Triangle b = Base Length of Isosceles Triangle

Example:

An Isosceles triangle with base length of 15 cm and side length of 12 cm. Find Inscribed Circle Radius of Isosceles Triangle.

Solution

Inscribed Circle Radius of Isosceles Triangle = 15√((2x12 - 15) / (2x12 + 15)) / 2
= 3.6029 cm

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