S= a*b*sin(угла)
sin60= √3/2
S= 8*5*корень из 3/2= 20√ 3
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Sabcd = AD*AB*sin 60°
Sabcd =
Sabcd =
S= a*b*sin(угла)
sin60= √3/2
S= 8*5*корень из 3/2= 20√ 3