# Stumped: Trapezoid problem with law of sin/cos …

This one stumped me. Thought you might enjoy..

What are the lengths of the diagonals?
It should be related to law of sin/cos. (The answers are decimal)

http://i50.tinypic.com/flhwz6.jpg

i.stack.imgur.com/eFGfS.png

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Hint: If you cut off a parallelogram from the left, you get a triangle with a base of 3 and a top angle of (what?). The law of sines then gives you the other two sides. Then restore the parallelogram, draw the diagonals, and use the law of cosines.

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Thanks! Did you get 3.86 and 4.14 ? –  JackOfAll Jun 26 '12 at 15:16
@JackOfAll: I got 2.7648 for the left edge and 3.89853 for the diagonal from the 50. Could just be rounding. –  Ross Millikan Jun 26 '12 at 20:37