Question

Find the radius of a circle whose circumference is 31.4 centimeters. Approximate pi as 3.14.

Answer 1

Answer:

$5\:\mathrm{cm}$

Step-by-step explanation:

The circumference of a circle is given by $C=2\pi r$, where $r$ is the radius of the circle.

What we're given:

• $C$ of 31.4

Solving for $r$:

$31.4=2\cdot 3.14 \cdot r,\\r=\frac{31.4}{2\cdot 3.14}=\boxed{5}$

Answer 2

Answer:

Radius of circle is 5 cm.

Step-by-step explanation:

Given that

• Circumference of circle = 31.4 cm
• Using value of π = 3.14

To Find :-

Radius of circle

Formula Used

Circumference of circle = 2 × π × r

Solution :-

Using Formula

Circumference of circle = 2 × π × r

Substitute the values into the formula

31.4 cm = 2 × 3.14 × r

multiply

31.4 cm = 6.28 × r

Divide , we get

31.4 cm /6.28 = r

5 cm = r

Hence, Radius of circle is 5 cm.