👉 In a triangle, the inradius is defined as the radius of the largest circle that can be inscribed inside the triangle. It is also known as the radius of the circumscribed circle. The formula to find the inradius (R) of a triangle is: \[ R = \frac{a}{\sqrt{(a^2 + b^2 + c^2)}}, \] where \( a, b \), and \( c \) are the sides of the triangle.