Question

if the area of a circle is equal to area of two circle of radii 3cm and 4cm then find the radius of the larger circle​

Answer 1

Let Radius of circle 1 be R1

Circle 2 be R2

Circle 3 be R3

Area of circle 2 + Area of circle 3 = Area of circle 1

π(R2)^2 + π(R3)^2 = 22/7(9+16)

22/7 × 25

= 78.6 cm^2 (approx)

Area of circle 1 = 22/7×R1×R1

78.6 = 22/7 × R1^2

78.6/π = 25

R1^2 = 25

Therefore R1 = 5 cm

Answer 2

Answer:

Step-by-step explanation:

Here is your Answer :

πr^2 = 3.14 * 3*3 = 28.6

πr^2 = 3.14 * 4*4 = 50.24

Total area = 50.24 +28.6 = 78.5

Bigger circle area = πr^2 = 78.5

r^2 = 78.5 /3.14= 25

Then r = √ 25 = 5cm