Question

find the area of a semi-circle of with a radius of 4.1mm. round to the nearest tenth

Answer 1

Answer:

26.4 mm²

Explanation:

The area of a semi-circle can be calculated as:

$A=\frac{\pi\cdot r^2}{2}$

Where π is approximately 3.14 and r is the radius of the circle.

So, replacing r by 4.1 mm, we get:

$\begin{gathered} A=\frac{3.14\cdot(4.1mm)^2}{2} \\ A=\frac{3.14\cdot16.81mm^2}{2} \\ A=\frac{52.7834}{2}mm^2 \\ A=26.4mm^2 \end{gathered}$

Therefore, the answer is 26.4 mm²