If the radius of the circle is descried by 10%then their_______ decries in the air.
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Answer:
19%
Step-by-step explanation:
Radius decreased 10%
So new R = r - (10/100)r
R = 9r/10
Area directly proportiotional to radius^2
R^2 =(9r/10)^2 = 81r^2/100
Decrease in area = r^2 - 81r^2/100
= 19r^2/100
% decrease = (19r^2/r^2)×100 = 19%
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