4 years ago

Please help. Trig: Laws of Cosines

Mathematics

1 answer:

ladessa [460]4 years ago

8 0

Answer:

16.2 units

Step-by-step explanation:

Greater angle: 180 - 72 = 108

D² = 10² + 10² - 2(10)(10)cos(108)

D² = 261.8033989

D = 16.18033989

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