Question:A parallelogram has sides 30 m and 14 m and one of its diagonal is 40 m long. Then, its area is : 

A `336 m^2` 
B `168 m^2` 
C `480 m^2` 
D `372 m^2` 

+ Answer
A 

+ Explanation
Let ABCD be a 11 gm in which AB = 30 m BC = 14 m & AC = 40 m.

Clearly, area of 11 gm ABCD = 2 (area of ABC).

Let a = 30, b = 14 & c = 42.

Then, `s = 1/2 (a + b + c) = 42`

:. Area of

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Irin Moni

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