Hello!
We know that the formula for area of a circle is:
A = pi × r^2
A semi circle is half of a circle, which means that its formula would be have of a circles as well.
Formula for area of a semi circle:
A = (pi × r^2) / 2
We'll use the same formula for a semi circle, only we'll divide it by 2 since it's a half circle.
A = (pi × r^2) / 2
A = (3.14 × r^2) / 2
A = 78.5 / 2
A = 39.25
ANSWER:
The area of the semi circle is C.) 39.25 centimetres squared.
