Area and Perimeter Practice Test 4

Question : 24 of 40

Marks: +1, -0

The radii of two circles are 5 cm and 12 cm respectively. Find the radius of a circle which is equal in area to these two circles.

Solution:

Area of the new circle =

π.5^2 + π.12^2

= 25π + 144π = 169π sq. cm.
=

π(13)^2

sq. cm
Hence, it is clear that the radius of the new circle will be 13 cm.

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