Question

Observe the angles in the figure and enter the proper number in the empty place.

1. m∠ABC = ___°. 

2. m∠PQR = ___°

3. m∠ABC + m∠PQR = ___°.

Answer 1

1. 40 

2. 50 

3. 90 

Note: Here, the sum of the measures of ∠ABC and ∠PQR is 90 °. Therefore, they are complementary angles.