Question

Find the radius of a circle whose area is equal to sum of the ages of three circles was ready Earth 3 cm 4 cm and 12 CM give the solution

Answer 1

Answer:

13 cm

Step-by-step explanation:

area of first circle with radius 3cm = π3^2 = 9π

area of 2nd circle with radius 4cm = π4^2 = 16π

area of 3rd circle with radius 12cm = π12^2 = 144π

sum of the areas of three circle = 9π + 16π + 144π = 169π

this is equal to the area of the required circle

πr^2 = 169π

$\pi {r}^{2} = 169\pi \\ {r}^{2} = 169 \\ r = \sqrt{169} \\ r = 13$

radius of the required circle = 13 cm

hope you get your answer