Question

Find the circumference of a circle whose area is 169 pi cm^ 2 .

pls help me ​

Answer 1

Answer:

C=2πr

Step-by-step explanation:

please make me brainiliest

Answer 2

Answer:

81.714 cm

Step-by-step explanation:

Given:

Area = 169π cm²

To find:

Circumference of the circle.

Solution:

We know that the formula to calculate the area of a circle is

Area = πr²

Area of the circle is given. So, substituting the area in the above formula,

169π = πr²

Cancel 'π' on both sides, since they are like terms.

We get

169 = r²

∴ r = $\sqrt{169}$

r = 13cm

Now, we can calculate the circumference of the circle.

The formula to calculate the circumference of the circle is

Circumference = 2πr

Since the value of π is not mentioned, we can use the value of π as $\frac{22}7$ for simple calculation.

Now, substituting the value of pi(π) and r(found above) in the formula,

Circumference = 2 × $\frac{22}7$ × 13

                         = $\frac{572}{7}$

                         = 81.714 cm