Question

Find the radius of the semicircle if its perimeter is 18cm

Answer 1

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$\pi \: r = c$



$\frac{22}{7} \times r = 18$


$r = \frac{18 \times 7}{22} = 5.72cm$



Hope it helps you


$<marquee > prabhudutt$

Answer 2

Given : perimeter =18cm
Radius of a semicircle is r
The semicircle has a perimeter given by 2r+(pi)r 

2r+(pi)r
=r(2+22/7)
=36r/7
the perimeter of the semicircle = 18 = 36r/7
=3.5 cm

Hence the radius = 3.5 cm