Question

find the diameter of a circle whose area is 628 cm2(square)
(use π=3.14)​

Answer 1

Answer:

Step-by-step explanation:

ANSWER:-

Given:-

• Area of circle 628 cm^2
• We need the diameter

Concept:-

Application of formula of area od circle.

Let's do!

$\sf{628 = \pi \ r^2}$

$\sf{\dfrac{628}{3.14} = r^2}$

$\sf{200 = r^2}$

$\sf{\sqrt{200} = r^2}$

$\sf{r = 14.14 \ cm}$

Now, Diameter = 2*r

So, 14.14*2

Diameter = 28.28 cm.

Remember:-

• Area of circle = pi*r^2
• Perimeter of circle = 2*pi*r
• And, Diameter = 2*r

Answer 2

Answer:

Diameter=20√2cm

Given:

Area=628cm²

π=3.14

To find:

Diameter of a circle

Step-by-step-explanation:

Area=πr²=628

⇒3.14×r²=628

⇒314/100×r²=628

⇒r²=628×100/314 (Here, 628 will cancelled by 2 with 314)

⇒r²=2×100

⇒r²=200

⇒r=√200

⇒r=10√2

Then,

Diameter=2r=2×10√2

⇒20√2cm

___________________________