If a circular paper disc is trimmed in such a way that its circumference is reduced in the ratio 2:5, In what ratio is the surface area reduced?
a
8 : 125
b
2 : 5
c
8 : 25
d
4 : 25
e
4 : 10
Explanation
Correct Option
dVideo Explanation
No video available
Post your Contribution
Share:
Discussions (8)
razzlecool
1 year ago
When you trim a circumference, the radius will reduce obviously.
So we can assume the initial and new radius are R₁ and R₂ respectively. It was stated that the circumference was reduced in the ratio 2:5 i.e R₂ : R₁ = 2:5 ---> 2R = 5R₁
