In the given figure,ABCD is a ||gm in which $D L ⊥ A B$ .If AB=10 cm and DL=4 cm then the ar(||gm ABCD)=?

(a) $40 c m^{2}$

(b) $80 c m^{2}$

(c) $20 c m^{2}$

(d) $196 c m^{2}$

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Solution

(a) 40 cm²
ar(||gm ABCD) = base × height = 10 × 4 = 40 cm²

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