Question

write the area of a circle of radius 2r.​

Answer 1

Answer:

Formula of area  = $\pi r^{2}$ -------eq

When r=2r, put in eqution

Area = $\pi(2 r)^{2} \\4\pi r^{2}$

Step-by-step explanation:

Answer 2

The area of a circle of radius 2r is 4πr²

Given :

The radius of the circle is 2r

To find :

The area of a circle

Formula :

The area of a circle of radius r unit is πr² sq.unit

Solution :

Step 1 of 2 :

Write down the radius of the circle

The radius of the circle is 2r

Step 2 of 2 :

Find area of the circle

The area of the circle

$\sf = \pi \times {(2r)}^{2}$

$\sf = \pi \times 4{r}^{2}$

$\sf = 4\pi {r}^{2}$