1.

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. 40 

2. 50 

3. 90

Note: Here, the sum of the measures of ∠ABC and ∠PQR is 90 °. 

Therefore, they are complementary angles.



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