Question

If radii of two concentric circles are 28 cms and 18 cms respectively. If the perimeter and the area of the circles are numerically equal. Then find the radius of the circle.

Answer 1

If radii of two concentric circles are 28 cms and 18 cms respectively. Find the area of the ring formed.

If the perimeter and the area of the circles are numerically equal. Then find the radius of the circle.

[Complete Question]

Given:

1) If radii of two concentric circles are 28 cms and 18 cms respectively.

2) If the perimeter and the area of the circles are numerically equal

To find:

1) Area of the ring.

2) Radius of the circle.

Solution:

Part (1)

R1 = 28 cm

R2 = 18 cm

Area of the ring is given by:

Area = π(R1² - R2²)

Area = π(28² - 18²)

Area = π(28+18)(28-18)

Area = π×46×10

Area = 460π cm²

Part(2)

Let the radius of the circle is r

We have given the perimeter and the area of the circles are numerically equal.

So we get;

2πr = πr²

r = 2 units.

Radius of the circle should be 2 units.

Answer 2

Answer:

ANSWER IN ABOVE CLIP

Step-by-step explanation:

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