Question

The circumference of a circle is 22cm find its radius and diameter math for 6th classes

Answer 1

C=2π r
C=22
Therefore,22=2*22/7*r
or, 22/2=22/7*r
or, 11*7/22=r
or, 77/22=r
or, 7/2=r
or, r=3.5 cm
Now, d=r*2 cm
or, d=3.5*2 cm
or, d=7cm
Thus, radius is 3.5 cm and diameter is 7cm.

Answer 2

Answer:

Radius of circle is 3.5cm

Diameter of circle is 7cm

Explanation:

Given that

Circumference of circle is 22cm

To find

Radius of circle and

Diameter of circle

Solution

Let

c as circumference of circle

r as radius of circle

d as diameter of circle

we know that

$c = 2 \times \pi \times r$

we can calculate radius

$r = \frac{22}{2\pi}$

as

$\pi = \frac{22}{7}$

hence

$r = 3.5cm$

Radius of circle is 3.5cm.

As we know that diameter of circle is always two times of its radius hence

$d = 2 \times 3.5 \\ = 7cm$

Hence diameter of circle is 7cm.