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- If the radius of a circle is diminished by 10%, then the area is diminished by:
Question 1:
If the radius of a circle is diminished by 10%, then the area is diminished by: A. 200%
B. 210%
C. 300%
Feedback Let the original radius be R cm. New radius = 2R
Area=πR^2
New Area =π2R^2
Increase in area =(4πR^−πR^2) = 3πR2
Increase percent =3πR^2/πR^2 x 100 =300%
Area=πR^2
New Area =π2R^2
Increase in area =(4πR^−πR^2) = 3πR2
Increase percent =3πR^2/πR^2 x 100 =300%
D. 310%
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