One diagonal of a rhombus is of length 6 cm and the perimeter of the rhombus is 20 cm.Find the area
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length of one side = 20/4 = 5cm
draw 2 diagonals in the rhombus to form 4 triangles
in 1 triangle, one side = 6/2 = 3cm
a2 + b2 = c2
a = 3 b= ? c= 5
9 + b2 = 25
b2 = 16
b = 4
2nd diagonal = 8cm
area of rhombus = 0.5 * 6 * 8
= 120
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