Question

What is the perimeter of a semi-circle?
(2 marks)

Answer 1

The perimeter of a circle is called the circumference, which is 2$\pi$r.
(1 mark)
Semi-circle is half of the circle and its circumference is half of the circle’s circumference, that is, $\frac{2\pi r}{2}$ = $\pi$r
(1 mark)