Question

the radii of two circles are 19 cm and 9 CM respectively find the radius of circle which has circumference you called to the sum of two circles​

Answer 1

Answer:

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Explanation:

Using the formula of the circumference of circle C = 2πr, we find the radius of the circle.

Radius (r₁) of the 1st circle = 19 cm

Radius (r₂) of the 2nd circle = 9 cm

Let the radius of the 3rd circle be r.

Circumference of the 1st circle = 2πr₁ = 2π (19) = 38π

Circumference of the 2nd circle = 2πr₂ = 2π (9) = 18π

Circumference of the 3rd circle = 2πr

Given that,

Circumference of the 3rd circle = Circumference of the 1st circle + Circumference of the 2nd circle

2πr = 38π + 18π

2πr = 56π

r = 56π/2π

r = 28

Therefore, the radius of the circle that has a circumference equal to the sum of the circumference of the two given circles is 28 cm.