The image of inscribed circle on a triangle ABC is attached
How to inscribe a circle in a triangle
Construct the triangle as required. In this case, it is labeled ABC
Bisect any two angles in the triangle. In this case, angle A and angle B is bisected.
The meeting point of the bisectors, is the center of the circle
Starting from the midpoint, extend to touch any part of the circle, this is the circumference of the circle