RRB NTPC Prelims Model Paper 4 with solutions

Question : 43 of 100

Marks: +1, -0

If the height of a triangle is increased by 25% and its base is decreased by 25%, then its area will

Solution:

(3) Let h and b be the height and base of the triangle.
Increased height is 1.25 h and decreased base is 0.75 b.
So, change in area =

{1 /2(1.25 h)(0.75 b)- {1/2 hb}}/{1/2hb}×100

={0.9375-1}/1×100

=-6.25% 6.25%

decrease

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