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The radii of two circles are 5cm and 12cm. The area of a third circle is equal to the sum of the area of the two circles. The radius of the third circle is :

A13 cm

B21 cm

C17 cm

D30 cm

Answer:

A. 13 cm

Read Explanation:

πr2=π×52+π×122\pi{r^2}=\pi{\times{5^2}}+\pi{\times{12^2}}

r2=25+144=169r^2= 25 + 144 = 169

r=169=13cmr = 169 = 13 cm


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