Homework Help: Trig

Posted by Chris on Sunday, February 17, 2013 at 8:17pm.

The diagonals of a parallelogram intersect at a 42◦ angle and have lengths of 12 and 7 cm. Find the lengths of the sides of the parallelogram. (Hint: The diagonals bisect each other.)

Trig - Steve, Sunday, February 17, 2013 at 8:37pm
if the sides have length a and b,

a^2 = 6^2 + 3.5^2 - 2(6)(3.5)cos42
b^2 = 6^2 + 3.5^2 + 2(6)(3.5)cos42

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