Question

find the area of circle with radius 21cm
​

Answer 1

Answer:

area of circle 2.

then, the area of the circle is 2×22/7×21×21=2772cm2

Answer 2

Answer:

Area of circle is 1386 ${cm}^{2}$

Step-by-step explanation:

Given -

Radius of circle is 21 cm

To find -

The Area of circle

Solution -

As we know that,

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

Where, r is radius of circle

Put the value of r we get

Area of circle = $\pi \times {21}^{2}$

Square means multiply the given values with itself twice.

${21}^{2} = 21 \times 21 = 441$

Square of 21 is 441

Area of circle = $\pi \times 441$

The value of π is $\frac{22}{7}$

Area of circle = $\frac{22}{7} \times 441$

Area of circle = 1386

Hence,

Area of circle is 1386 ${cm}^{2}$