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26 Nov 2018, 05:20
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Difficulty:
5%
(low)
Question Stats:
85% (00:51) correct
15%
(00:59)
wrong
based on 113
sessions
History
Date
Time
Result
Not Attempted Yet
If the radius of a circle is increased by 10%, by how much is its area increased?
A. 25%
B. 21%
C. 20%
D. 15%
E. 10%
A. 25%
B. 21%
C. 20%
D. 15%
E. 10%
26 Nov 2018, 09:56
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My solution:
1st (r=2)
pi(r)^2=3.14(4)
pi(r)^2= 12.56
2nd (r=2.2)
pi(r)^2=3.14(4.84)
pi(r)^2=15.20
Calculate change
15.20-12.56=2.64
2.64/12.56=21%
*looking for feedback. I subbed in value 5 too for r and got 20% in the end....
1st (r=2)
pi(r)^2=3.14(4)
pi(r)^2= 12.56
2nd (r=2.2)
pi(r)^2=3.14(4.84)
pi(r)^2=15.20
Calculate change
15.20-12.56=2.64
2.64/12.56=21%
*looking for feedback. I subbed in value 5 too for r and got 20% in the end....
