urgent....please....
Find the radius of the circle whose area is equal to the sum of the area of three circled with radii 3 cm, 4 cm and 12 cm.
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Area of big circle (C) = Ar of (C1+C2+C3)
C = π3²+π4²+π12² = π(3²+4²+12²) = 22/7 (9+16+144) = π(169)
then
C = πR² = π(169)
then
R = √169 = 13
R = 13 cm
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