The circle that fits the inside of a triangle. Also called an "inscribed circle".

It is the largest circle that will fit and it just touches each side of the triangle.

The center is called the "incenter" and is where each angle bisector meets.

Have a play with it below (drag the points A, B and C):

It is the largest circle that will fit and it just touches each side of the triangle.

The center is called the "incenter" and is where each angle bisector meets.

Have a play with it below (drag the points A, B and C):

See: Angle Bisector