Question

Circumference of a circle is 66cm. Find its radius and diameter . Show with solution

Answer 1

$2\pi \: r = 66 \\ r = \frac{66 \times 7}{2 \times 22} \\ r = \frac{21}{2} \: \: \: \: \: \: \: 10.5$
$Radius = 10.5 \: cm \\ \\ Diameter = (2 \times 10.5) \: cm \\ 21 \: cm$











MARK BRAINLIEST.....

Answer 2

Given,

Circumference of a circle = 66 cm

To Find,

The radius and diameter =?

Solution,

We can solve the question as follows:
It is given that the circumference of the circle is 66 cm.

We know,

$Circumference = 2\pi r$

$66 = 2\pi r$

From the above equation, we can find the radius.

$66 = 2\pi r$

$\frac{66}{2} = \pi r$

$33 = \pi r$

$33 = \frac{22}{7} r$     (Since, $\pi = \frac{22}{7}$)

$33*\frac{7}{22} = r$

$r = 10.5 cm$

Hence, tha radius is 10.5 cm.

Now,

$Diameter = 2r$

Substituting the value of r in the above formula,

$Diameter = 2r$

        $= 2*10.5$

         $= 21 cm$

Hence, the radius of the circle is 10.5 cm and the diameter of the circle is 21 cm.