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

Here, AC = 22 cm, BM = 3 cm, DN = 3 cm
Area of quadrilateral ABCDF = Area of ∆ABC + Area of ∆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.

Class 7 Maths Chapter 11 Exercise 11.4

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