Question

Find the circumference of a semicircsemicircular shape on a line of length 10 cm

Answer 1

Diameter is 10 cm. So radius will be 5cm. Perimeter =pieR=3.14*5=15.7

Answer 2

$the \: formula \: for \: circumference \: is \: 2\pi \: r \: and \: becoz \: its \: a \: semicircle \: the \: formula \: = 2\pi \: r \div 2 = \pi \: r \\ therefore \: solution = \\ diameter \: of \: semicircle = 10 \: cm \\ radius \: of \: semicrcle = 10 \div 2 = 5cm \\ circumference \: of \: semicircle = \pi \: r \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{22}{7} \times 5 = 15 .714cm$
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