please answer the question 3 number
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Answered by
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We have to find the area of the figure
For that consider the figure as 4 parts :
1. The large semicircle
2, 3&4 the smaller semicircles
area of semicircle=pi×r^2/2
radius of first circle=21 cm
radius of 2, 3, 4 circles=21/3=7cm
Therefore area of fig= Area of the bigger semicircle+3× area of the smaller semicircles.
i.e., A=22/7×21×21/2+3×22/7×7×7/2
A=693+231
A=924cm^2
For that consider the figure as 4 parts :
1. The large semicircle
2, 3&4 the smaller semicircles
area of semicircle=pi×r^2/2
radius of first circle=21 cm
radius of 2, 3, 4 circles=21/3=7cm
Therefore area of fig= Area of the bigger semicircle+3× area of the smaller semicircles.
i.e., A=22/7×21×21/2+3×22/7×7×7/2
A=693+231
A=924cm^2
Answered by
1
Diameter of big circle = 21
area of big figure = is pi r^2 = 22/7 * 10.5 ^2 = 346.36/2 = 173.18 .
area of small circle = d of small circle = 21/3 = 7
area = 38.48 /2 = 19.24
= 19.24 * 3 + 173.18 is your answer
= 230.9cm2.
i suggest you to check from your book answers
hope it helps
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