Question

if the circumference of a circle is 57.2cm then it's radius will be​

Answer 1

Answer:

r-9.1 cm

Step-by-step explanation:

We know that the circumference is the perimeter or boundary of the circle

If the circumference were opened then it would form a straight line segment.

So, here we have been given the length of the line segment(circumference)I.e. 57.2cm.

So,we know that the formula of finding the circumference is 2πr.

2πr=57.2

=2×22/7×r=57.2

44r/7=57.2

Then,r=57.2×7÷44=400.4÷44=9.1cm

r=9.1cm

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Answer 2

Answer:

Radius of circle is 9.1 cm.

Step-by-step explanation:

Given -

Circumference of circle is 57.2 cm

To find -

The radius of circle

Solution -

As we know that,

Circumference of circle = $2 \times \pi \times r$

Where,

r is a radius of circle.

Put the given values in these formula we get

$57.2 = 2\pi \times r$

$\frac{57.2}{2\pi} = r$

$\frac{28.6}{\pi} = r$

The value of π is 3.14 .

$\frac{28.6}{3.14} = r$

$r = 9.10$

So,

Radius of circle is 9.1 cm.