Answer:
P.S when it says OVER it me like a fraction
and PLZ MARK ME BRAINLY
Step-by-step explanation:
Consider a circle of radius 8 centimetres. Recall that the centre angle in a circle is always 360˚ . However, a semi-circle is a circle cut in half. Hence, the centre angle for the semi-circle is cut in half, or has a measure of 180˚
Here's a diagram of what's going on.
Before applying the formula, let's convert 180˚ to radians.
180˚ over 1 times π over 180°
We will now use the formula to determine the area of this semi-circle.
A= 1/2 × π × 8²
A=1/2 × π × 64
A= 32πcm²
We can confirm this using the formula for area of a semi-circle, A= r²π over 2
A= 8²π over 2
A= 32πcm²
Same, so both formulae work.
