Question

Calculate the area and perimeter of the following ring where a = 7cm, b = 14cm Area of Ring: (i) (ii) Perimeter of Ring:

Answer 1

Given : a ring inner radius = 7 cm & outer radius = 14 cm

To find : Area of Ring and Perimeter of Ring: 132 cm

Solution:

Area of circle = π Radius²

Perimeter of circle = 2π Radius

Area of ring

= Area of bigger circle - area of smaller circle

= π (14)² - π (7)²

= π(14 + 7)(14 - 7)

= π(21)(7)

use π = 22/7

= (22/7)(21)(7)

= 462 cm²

Perimeter of ring

Area of bigger circle + area of smaller circle

= 2π(14) + 2π(7)

= 2π(21)

= 2(22/7)(21)

= 132 cm

Area of Ring: 462 cm²

Perimeter of Ring: 132 cm

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Answer 2

Answer:

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