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OpenStudy (anonymous):
A triangle has sides of length 4 and 5, with an angle of (5pi/8) between them. Determine the lengths of the third side, exactly, without using a calculator.
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OpenStudy (shubhamsrg):
cosine rule ?
OpenStudy (anonymous):
c^2=a^2+b^2-2ab cos(C)
OpenStudy (shubhamsrg):
yep..use this.. here a=4, b=5 C = 5pi/8 you need to find c ..
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