Question

3. Find the angle complementary to the angle 80°25′. A. 180° B. 9°35′ C. 90° D. 99°35′

Answer 1

"Complementary" angles sum to 90°.

Since we are using minutes as well...

80°+d°+25'+m'=90° subtract 80° from both sides

d°+25'+m'=10° subtract 25' from both sides

d°+m'=9°+60'-25'

d°+m'=9°+35'

9°35'