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Drawing the short diagonal, one obtains two isosceles triangles.
The included angle of the two triangle become 80°
Hence area = ½ ab Sine C
=1/2 x 20 x 20 Sines 80°
=200 x sine 80°
= 196.96 cm^2
Total area of the rhombus = 196.96 x 2
=393.92 cm^2
joseph rimiru answered the question on October 3, 2017 at 17:10
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