Question

the circumference of a compact disc is 28.26cm. what is the radius of the compact disc

Answer 1

Compact disk is in the shape of a circle. Hence the circumference of a compact disk can be equated to that of a circle.

=> Circumference of Circle = 28.26 cm

We know that Circumference of a circle is 2πr, where r is the radius of the circle.

Hence substituting them in the formula we get,

2πr = 28.26

2 * 3.14 * r = 28.26

6.28 * r = 28.26

=> r = 28.26 / 6.28

=> r = 4.5 cm

Hence the radius of the compact disk ( CD ) is 4.5 cm.

Answer 2

Answer:

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