Question

if the side of a triangle is increased by 30% while the height of triangle is decreased by 20% find the percent of increase in area​

Answer 1

Answer:

4%

Step-by-step explanation:

Let base=100x and height=100y

then area = 1/2*100x*100y=10000xy/2

= 5000xy

Now the base  is increased by 30% and height of triangle is decreased by 20%

so base =130x and height=80y

so area=1/2*130x*80y=5200xy

% increase in area=100*(5200xy-5000xy)/5000xy

=100*200xy/5000xy

=20000xy/5000xy

=4%