The radius of a circle is increased by 1%. Find how much % does its area increases?
1.01%
5.01%
3.01%
2.01%
Explanation:
r = 100 r = 101
$r^2$ = 10000 $r^2$ = 10201
10000 ---- 201
100 ---- ? => 2.01%
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Find the area of the quadrilateral of one of its diagonals is 20 cm and its off sets 9 cm and 6 cm?