Question

Work out the perimeter of a semi circle with the diameter of 18cm

Answer 1

`\sf\\Given:\\\textsf{Diameter of semi circle (d) = 18cm}\\\textsf{Therefore, radius of circle (r) = 9cm}\\\textsf{Now,}\\\textsf{Perimeter of semi circle}=\pi r+2r=\pi(9)+2(9)=18+9\pi \approx46.274cm`