Question

Please help. Trig: Laws of Cosines
If a rhombus whose side measures 10 and the smaller angle is 72*, find the length of the larger diagonal, to the nearest tenth.

Answer 1

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