Four identical semi-circles are drawn inside the semi-circle with diameter AB in the figure, such that AB = 8cm. What is the perimeter of the figure bounded by five semi-circles? (pi=3) A. 30 B. 24 C. 15 D. 12

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1 Answer
Jun 19, 2018

24toB

Explanation:

"the circumference of a circle (C) is"

•color(white)(x)C=pidrArr1/2C=1/2pid

"Perimeter "="P of semi-circle"+"P of 4 identical"

"using "pi=3

d" of semi-circle "=8

"d of 4 identical semi-circles "=8/4=2

"perimeter "=1/2xx3xx8+4xx1/2xx3xx2

color(white)("perimeter ")=12+12=24" cm"