Question

If the perimeter of a circle is 22 cm, then its radius will be ​

Answer 1

Answer:

Thus, radius is 3.5 cm and diameter is 7cm.

Answer 2

Question:

If the perimeter of a circle is 22 cm, then its radius will be ​______

Given:

Circumference of the circle = 22cm

To Find:

• Radius

• Diameter

$\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\qbezier(2.3,0)(2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,-2.121)(0,-2.3)\qbezier(2.3,0)(2.121,-2.121)(-0,-2.3)\put(0,0){\line(1,0){2.3}}\put(0.5,0.3){\bf\large r\ cm}\end{picture}$

Formula used:

$\textsf{circumference of cirlce} = 2\pi\times r$

Solution:

Given circumference of circle = 22cm

But circumference of circle  $= 2\pi\times r$

$22cm = 2\pi \times r\\\\22cm = 2\times \frac{22}{7} \times r\\\\22cm = \frac{44}{7} \times r\\\\22cm \times \frac{7}{44}= r\\\\r=22cm \times \frac{7}{44}\\\\r=\frac{7}{2}\\\\r=3.5 cm$

$\boxed{r=3.5 cm}$

$Diameter = 2 r\\\\R=3.5cm\\\\d=3.5\times2\\\\d=7cm$

$\boxed{d=7cm}$

Answer:

$\boxed{r=3.5 cm}$

$\boxed{d=7cm}$