A parallelogram has sides A, B, C, and D. Sides A and B have a length of #4 # and sides C and D have a length of # 7 #. If the angle between sides A and C is #pi/8 #, what is the area of the parallelogram?

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Answer 1 · 2018-03-23T13:31:45

Area of the parallelogram

#=AxxCxxsin(pi/8)#

#=4xx7xxsqrt(1/2(1-cos(pi/4))#sq unit

#=4xx7xxsqrt(1/2(1-1/sqrt2)#sq unit

#~~10.7#sq unit