Question

The sides of a triangle measure 13cm, 14 cm and 15cm .Its semi-perimeter is ______?​

Answer 1

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$semiperimeter = \frac{1}{2} \times the \: sum \: of \: three \: sides \\ meanwhile \: \frac{1}{2} \times 13 + 14 + 15 \\ = \frac{1}{2} \times 42 \\ = 21$