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Find the area of the equilateral ABCD. Here, AC = 22 cm, BM = 3 cm, DN = 3 cm and BM ⊥ AC, DN ⊥ AC.

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Here, AC = 22 cm, BM = 3 cm, DN = 3 cm

 Area of quadrilateral ABCDF = Area of Δ ABC + Area of Δ ADC 

= 1/2  x AC x BM + 1/2  x AC x DN 

= 1/2  x 22 x 3 + 1/2  x 22 x 3 = 3 x 11 + 3 x 11 = 33 + 33 = 66 cm2 

Thus, the area of quadrilateral ABCD is cm2.

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