Question

answer above question ​

Answer 1

GOOD MORNING

Perimeter of a semicircular having diameter D is = π × D

=>

π × D = 30 × 2

=>

D = 60/3.14

=>

D = 19.09cm

Answer 2

Perimeter of circle :-

$= 2 \: \pi \: r$

For cemi circle :-

$= \frac{2\pi r}{2}$

Here semi circle's perimeter is given :-

$= 30cm$

Than,

$30 = \frac{2\pi r}{2} \\ \\ 30 = \pi r \\ \\ 30 = \frac{22}{7} \times r \\ \\ \frac{30 \times 7}{22} = r \\ \\ r = 9.54cm \\ \\ \\ \\ d = 2r \\ \\ = 2 \times 9.54 = 19.09 = 19cm$

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