Question

RADIUS OF CIRCLE IS DECREASED BY 50% FIND ITS PERCENTAGE

Answer 1

2M +/- M square/ 100

2×50-50×50/100

100-2500/100

100-25

75%

Answer 2

Area=πr^2

new radius =r-50/100r

=r/2

new area=πr^2/4

%decreases in area

πr^2/4 -πr^2\πr^2*100

3πr^2/4πr^2*100

3/4*100

75% is the answer

Here \ shows whole divide

I hope you will never forget this concept

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