Question

Radius= 4cm. find the area and diameter of the circle​

Answer 1

given:

radius= 4 cm

to find:

the area and the diameter of the circle.

solution:

diameter:

$d = 2r$

$d = 2 \times 4$

$d = 8 \: cm$

therefore, the diameter of the circle is 8 centimeters.

area:

$a = \pi {r}^{2}$

$a = \pi \times {4}^{2}$

$a = 50.26548 \: {cm}^{2}$

$a = 50.27 \: {cm}^{2}$

hence, the area of the circle is 50.27 square centimeters.

Answer 2

Given:

• Radius= 4 centimeters

Diameter of the circle:

$diameter = 2r$

$d = 2 \times 4$

$d = 8 \: cm$

Area of the circle:

$area = \pi {r}^{2}$

$a = \pi \times {4}^{2}$

$a = 50.26548 \: {cm}^{2}$

$a = 50.27 \: {cm}^{2} \: (2 \: d.p)$