the diameter of thee circles In the figure are 21cm ,14cm and 7cm what is the area of the shaded region
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Answered by
32
Area of all three circles= pie× radius^2
1st circle= 22/7 × 21/2cm ×21/2cm
=346.5cm^2
Area of 2nd circle= 22/7 × 14/2cm × 14/2cm
= 154cm^2
Area of 3rd circle= 22/7 × 7/2cm×7/2 cm
=38.5cm^2
Area of shaded region= 346.5cm^2-( 154+38.5)cm^2
= 346.5cm^2 - 192.5cm^2
= 154cm^2
Hope it helps
1st circle= 22/7 × 21/2cm ×21/2cm
=346.5cm^2
Area of 2nd circle= 22/7 × 14/2cm × 14/2cm
= 154cm^2
Area of 3rd circle= 22/7 × 7/2cm×7/2 cm
=38.5cm^2
Area of shaded region= 346.5cm^2-( 154+38.5)cm^2
= 346.5cm^2 - 192.5cm^2
= 154cm^2
Hope it helps
rekhadrall79:
Apply pie r2 in all three circles
means
you give answer
rekha plz tell from which step it is wrong?
plz
Subtract small circles from big circle of diameter 21
thanks
21 is given as diameter but u took it as the radius
now is it correct?
sorry for carelessness
Answered by
21
Area of bid circle=πr2
22/7×10.5×10.5(radius=21/2=10.5)
=346.5cm2
Similarly,area of both small circle=154 and 38.5 sum of both small circle area's will 192.5
Area of shaded portion= 346.5-192.5
Will give 154cm
22/7×10.5×10.5(radius=21/2=10.5)
=346.5cm2
Similarly,area of both small circle=154 and 38.5 sum of both small circle area's will 192.5
Area of shaded portion= 346.5-192.5
Will give 154cm
thanks
Your welcome
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