Question

Sides of a triangle are 45 cm ,39 cm and 42cm. find its area
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Answer 1

Answer:

756 cm^2

Step-by-step explanation:

Let a=45;b=39,c=42

S= (a+b+c)/2

=63

So,

∆^2=S(S−a)(S−b)(S−c)

=63×18×24×21

∆= 63×18×24×21

=756 cm^2

Hence, this is the answer.

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