Question

If ∠DEF and ∠PRS are complementary what is the measure of ∠PRS if ∠DEF is 78

Answer 1

We know that complementary angles add to 90 degrees.

∠DEF and ∠PRS are complementary

∠DEF + ∠PRS =90

78+ ∠PRS =90

Subtract 78 from each side

78+ ∠PRS -78 =90-78

∠PRS =12