Question

a semicircles perimeter is 39.6 cm. Find its diameter​

Answer 1

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$perimeter \: of \: semicircle = 39.6 \: cm \\ \pi r + 2r = 39.6 \\ r(\pi + 2) = 39.6 \\ r( \frac{22}{7} + 2) = 39.6 \\ \frac{36}{7} r = 39.6 \\ \frac{36}{7} \times \frac{d}{2} = 39.6 \\ \frac{18}{7} d = 39.6 \\ d = \frac{39.6 \times 7}{18} \\ \boxed{d = 15.4 \: cm} \\ \\ \red{\mathfrak{ \large{\underline{{Hope \: It \: Helps \: You}}}}} \\ \blue{\mathfrak{ \large{\underline{{Mark \: Me \: Brainliest}}}}}$