In c ABCD, l (AB)= 13cm,
l(DC)= 9cm, l(AD) 8cm,
find the area □ABCD
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ABCD is a trapezium, side AB || side DC, l(AB) = 13 cm, l(DC) = 9 cm, l(AD) = 8 cm, Area of a trapezium = x sum of lengths of parallel sides x height ∴ A (ABCD) = x [l(AB) + l(DC)] x l(AD) = (1/2) x (13 + 9) x 8 = (1/2) x 22 x 8 = 11 x 8 = 88 sq.cm ∴ The area of ABCD is 88 sq.
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