Question:The three sides of a triangle are 3 cm, 4 cm and 5 cm respectively. Then, its area (in sq.cm) is : 

A `4sqrt(2)` 
B `2sqrt(3)` 
C `sqrt(23)` 
D 6 

+ Answer
D 

+ Explanation
a = 3, b = 4 and c = 5.

`:. s = 1/2 (3 + 4 + 5) = 6`

:. Area` = sqrt(6 xx 3 xx 2 xx 1)`

            `= sqrt(36)`

           `= 6 sq. cm.`

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Irin Moni

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