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Answer

(a) The perimeter of the figure = 72cm . 

By inspection, total perimeter of 4 triangles

  = 72 + 8* 9 = 144 cm

So perimeter of each triangle = 144/4 = 36 cm.

(b) AB + BC + CA = 36 cm

BC = 9 cm

AB + CA = 27 cm

Given

AB + BC – CA = 6 cm

CA – AB = 3 cm

AB = 12 cm

Area of triangles= 4 * (1/2) * 9 * 12 = 216  cm²

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