Answers

2014-06-24T11:24:53+05:30
We can express the original area of a triangle as
a=1 ( B)( H)
     2

If the new base is 10% greater, the new b is (1.1)b.
If the new height is 20% less, the new h is (0.8)h.

Now substituting, we get
 = 
a=1 (1.1 X B)(0.8 X H)
     2
a=1 (0.88) BH
     2

Notice how the original area is only 88% of what it was...
So there was a 12% decrease in area.

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