Question

angle sum theorem
the ____ of the measures of a triangles angles is ____ °.
$delta abc, mangle a + mangle b + mangle c =$ ______ °

Explanation:

The Angle Sum Theorem for triangles states that when you add together the measures of all three interior angles of any triangle, the total is a constant value. This is a fundamental geometric rule.

Answer:

The sum of the measures of a triangle's angles is $\boldsymbol{180}^\circ$.
$\Delta ABC, m\angle A + m\angle B + m\angle C = \boldsymbol{180}^\circ$