The area of a parallelogram is 80cm2. Two of the sides are of lengths 6cm and 15cm.Find the angles of the parallelogram corr to nearest 0.1°?
回答 (1)
2016-08-22 11:13 pm
Sol
平行四邊形面積=邊長*邊長*夾角正弦
80=6*15*Sinw
Sinw=8/9
w=62.7度
平行四邊形面積=邊長*邊長*夾角正弦
80=6*15*Sinw
Sinw=8/9
w=62.7度
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