1 Answer

Squall Huang · Answer 1 · 2019-01-23T00:50:24+0000

1. The angles of the rectangle are each 90.

To find the missing angle you subtract 15 by 90.

∠4 = 90 - 15
∠4 = 75

2. Supplementary angles add up to 180.

42 + x = 180
x = 180 - 42
x = 138

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