Question

What fraction of an hour is $15$ minutes?The diameter of a circle is $26cm.$ Find its radius.

Answer 1

Part (1).

We know that,

$1$ hour = $60$ minutes

$60$ minutes = $1$ hour

$1$ minute = $\frac{1}{60}$ hour

Then, for 15 minute

$15$ minute = $\frac{15}{60}$ hour

$15$ minute = $\frac{1}{4}$ hour

$15$ minute = $0.25$ hour

Hence, this is the answer.

Part (B),

Given that,

The diameter of a circle $=26c.m.$

Then, radius =$\frac{d}{2}=\frac{26}{2}=13c.m.$

Hence, this is the answer.