Respuesta :

muhammadssempijja707

Answer:

16. 60° from (180-120)°

17. 68° from (90-22)°

18. 80° from (180-100)°

19. 45° and 135°

20. 22.5° and 67.5°

Step-by-step explanation:

Supplementary angles add up to 180°

Complementary angles add up to 90°

For 19: let the angle be x

Then other angle is 3x

3x + x = 180°

4x = 180°

x = 45°

The other angle is 3x = (3×45) = 135°

For 20: let the first angle be m

Then the other angle is 3m

3m + m = 90°

4m = 90°

m = 22.5°

The other angle will be 3m = (3×22.5) = 67.5°

averybutler8

Answer:

16. missing angle is 60 degrees, because supplementary angles add up to 180 degrees.

17. missing angle is 68 degrees, complimentary add up to 90 degrees.

18. missing angle is 80 degrees, supplementary add up to 180.

19. 4x= 180

x= 45

3x=135

20. 4x= 90

x=22.5

3x=67.5

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