Question

What is the area of a semi-circle with a diameter of 6cm?

Answer 1

Answer:

Area of the semicircle = $14.13cm^2$

Step-by-step explanation:

Area of a circle=$\pi r^2$

Area of a semicircle= $\pi r^2/2$

For:

  Diameter=6 cm

 Radius= 6/2=3 cm

As, $\pi =\frac{22}{7}=3.14$

Area of the semicircle:

                  =$(3.14*3*3)/2$

          $=(3.14*9)/2\\\\=28.26/2\\\\=14.13cm^2$

Area of the semicircle = $14.13cm^2$

Answer 2

Formula for the area of a circle: A = pi * r^2

A semi-circle is half of a circle. So, we will need to divide the area of the total circle by 2 to find the area of a semi-circle.

r = d / 2

r = 6 / 2 = 3

A = pi * 9

A = 9pi

Semi-circle:

A = 9pi / 2

A = 4.5 pi cm^2 or 14.14 cm^2

Hope this helps!! :)