SmarterEd

Aussie Maths & Science Teachers: Save your time with SmarterEd

Area, SM-Bank 110

Calculate the area of the following semi-circle, giving your answer to 2 decimal places.   (2 marks)
 

Show Answers Only

\(0.57\ \text{mm}^2\ (2\ \text{d.p.})\)

Show Worked Solution

\(\text{Diameter}=1.2\ \text{mm}\)

\(\therefore\ \text{Radius}=0.6\ \text{mm}\)

\(\text{Area semi-circle}\) \(=\dfrac{1}{2}\times\pi r^2\)
  \(=\dfrac{1}{2}\times\pi\times 0.6^2\)
  \(=0.5654\dots\)
  \(\approx 0.57\ \text{mm}^2\ (2\ \text{d.p.})\)