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  1. If the altitude of a triangle is increased by 10% while its area remains same, its corresponding base will have to be decreased by
    1. 10 %
    2. 9 %
    3. 9
      1
      %
      11
    4. 11
      1
      %
      9
Correct Option: C

Let the base of triangle be decreased by x%.
According to the question,

10 - x -
10x
= 0
100
[∵ Area remains same]
⇒ x +
x
= 10
10

10x + x
= 10 ⇒
11x
= 10
1010

⇒ x =
100
= 9
1
%
1111



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