Question

how do u get the answers for 18 and 19

Answer 1

For 18)

It is: 90-81 = 9 degrees

For 19)

It is: Angles are complementary if their sum is 90 degrees. The complement if a 20 degree angle then is 70 since 20+70 = 90

Answer 2

Answer:

18) 90-81=9

    Complementary angles are angles that add up to 90 degrees. If the angle is 81 degrees, then its complementary angle will be 9 degrees

19) 180-20=160

    Supplementary angles are angles that add up to 180 degrees. If the angle is 20 degrees, then its supplementary angle will be 160 degrees.