Question

Find the circumference of a circle and the area whose diameter is 40 cm and Pi is equals to 3.14

Answer 1

Answer:

Area = 1256 cm² and Perimeter = 125.6 cm

Step-by-step explanation:

Radius (r) = diameter / 2 = 40 / 2 = 20 cm

Area of a circle = π r² = 3.14 * 20 * 20 = 1256 cm²

Perimeter of a circle = π d = 3.14 * 40 = 125.6 cm

Answer 2

Area is 1256 sq cm

Circumference is 125.6cm

Step-by-step explanation:

Given that

Diameter of circle is 20cm

To find

Area of circle

Circumference of circle

Solution

As we know radius of circle is always half of diameter of circle hence

$radius = \frac{diameter}{2} = \frac{40}{2} = 20cm$

As we know that

$area \: of \: circle = \pi \times {radius}^{2}$

hence

take

$\pi = 3.14$

now

$area \: of \: circle = 3.14 \times 20 \times 20$

hence by multiplication we get

$area \: of \: circle = 1256 {cm}^{2}$

$circumference \: of \: circle = 2 \times \pi \times radius$

$= 2 \times 3.14 \times 20$

by multiplication we get

$circumference \: of \: circle = 125.6cm$