1.

In the given figure, ABCD is a trapezium, side AB || side DC, l(AB) = 13 cm, l(DC) = 9 cm, l(AD) = 8 cm, find the area ABCD.

Answer»

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. cm



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