Homework Help: Pre-calculus

Posted by Jamilla on Friday, April 9, 2010 at 3:54am.

Find the lengths of the diagonals of a parallelogram with adjacent sides of 12cm and 13 cm if the angle between the sides is 50 degrees.

The shorter diagonal is what in terms of cm?
The longer diagonal is what in terms of cm?

Pre-calculus - Reiny, Friday, April 9, 2010 at 7:58am
Use cosine law
(shortone)^2 = 12^2 + 13^2 - 2(12)(13)cos50°
etc

for the longone, replace the end part with cos130°

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