Question

find diameter of a circle whose area in equal to sum of areas of two circles of radii 40cm and 9cm
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Answer 1

Step-by-step explanation:

Using the formula....

Pie r^2

= 1600 + 81

= underoot 1681 = 41

Then

41*2=82

Answer 2

Area of circle=πr²

=1600+81

=√1681=41

=41×2

82cm