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Shape Conversion of Solids

The sides of ...

Question

The sides of $Δ A B C$ are $8$ cm, $7$ cm and $5$ cm respectively. Its semi perimeter is :

A

10 c m

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B

5 c m

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C

15 c m

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D

20 c m

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Solution

The correct option is D $10 c m$
Let in $△ a r ∥ g m A B C D$ , $a = 8 c m, b = 7 c m, c = 5 c m$
$∴ S = \frac{a + b + c}{2} = \frac{8 + 7 + 5}{2} = 10 c m$

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