Calculate the following (pls see attachment)
Your assistance is really appreciated
- length of AB in millimetres
- area of the semicircle in sq millimetres
As for the question, part 1 can be answered by applying the Pythagorean Theorem to the triangle. You will only end up with one unknown, since .
For part 2, use the formula for the area of a circle. A circle of radius has an area of , so a semicircle will have half that area: .