State true or false:
The semi-perimeter of a triangle of sides 4 cm, 8 cm, 6 cm is 18 cm.

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Solution

False
$s = \frac{4 + 8 + 6}{2} = \frac{18}{2} = 9 c m$

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Perimeter of a regular octagon of side 6 cm is 36 cm.

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State whether true or false:
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