Question

The radius of a circular pipe is $10cm$. What length of tape is required to wrap once around the pipe $(\pi =3.14)$?

• A. $60cm$
• B. $31.4cm$
• C. $62cm$
• D. $62.8cm$

Answer 1

The correct option is D $62.8cm$

Given: Radius of the pipe $=10cm$

Length of tape required is equal to the circumference of the pipe.

Circumference of a circle $=2\pi r$

Circumference of the pipe $=2\pi r$

$=2\times 3.14\times 10cm$

$=62.8cm$

The circumference of the pipe is $62.8cm$.