Question

if the area of a circle is154cm²,then perimeter of circle is
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Answer 1

Answer:

Step-by-step explanation:

area=154cm²

πr²=154

22/7 × r²=154

r²=154×7/22

r²=49

r=7 cm

perimeter or circumference of the circle =2πr

                                                                   =2×22/7×7

                                                                   =44 cm

Answer 2

As per given information ,

Area of circle is 154 ${cm}^{2}$

We have to find out the perimeter of circle.

As we know that,

Area of circle $= \pi {r}^{2}$

Put the given values in the formula we get

$154 = \pi {r}^{2}$

$\frac{154}{\pi} = {r}^{2}$

The value of π is 3.14 .

$\frac{154}{3.14} = {r}^{2}$

${r}^{2} = 49.04$

When square is shift from left to right side it becomes square root.

$r = \sqrt{49.04}$

The square root of 49.04 is 7.002 .

r = $7.002$

Radius = r = 7.002 cm

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

Put the value of r (Radius) ,

Circumference of circle = $2 \times \pi \times 7.002$

Circumference of circle = $14.004 \times \pi$

Put the value of π = 3.14

Circumference of circle = $14.004 \times 3.14$

Circumference of circle = $43.97$

Hence,

Circumference of circle is 43.97 cm.