Question

1. ∠abc and ∠cbd are a linear pair. 1) given 2) m∠abc + m∠cbd = m∠abd 2) dropdown with options: definition of congruent angles, definition of complementary angles, angle addition postulate, substitution property of equality

Explanation:

The Angle - Addition Postulate states that if point B lies in the interior of ∠ABD, then m∠ABC + m∠CBD = m∠ABD. Here, since ∠ABC and ∠CBD are parts of ∠ABD, this is an application of the Angle - Addition Postulate.

Answer:

Angle Addition Postulate