Question

taking π = 3.14, find the radius and circumference of a circle whose area is 379.94 m^2

Answer 1

Answer:

Radius and circumference of circle are $11 \ m$ and $69.08 \ m$ respectively .

Step-by-step explanation:

To find :  radius and circumference of circle .

Given : area of circle is $379.94\ m^{2}$ and $\pi = 3.14$

• As per given that we know that area of circle is $379.94\ m^{2}$ . We are asked to find  radius and circumference of circle.
• We use following formula to find area of circle, using this formula we  find radius of circle by substituting the given values.
• Area of circle $=\pi r^{2}$

       $379.94 = 3.14 \times r^{2} \\r^{2} = \frac{379.94}{3.14} \\r^{2} = 121 \\ r= 11\ m$

• Circumference of circle is the total length of boundary of circle .  
• Circumference of circle = $2\pi r$

                                               $= 2\times 3.14\times 11 \\= 69.08\ m$