question_answer 1)

Find the perimeter of the following figure, which is a semicircle including its diameter.

Answer:

                Diameter of the semicircle (d) \[=\text{1}0\text{ cm}.\] Circumference of semicircle \[=\frac{1}{2}\pi d=\frac{1}{2}\times 3.14\times 10\] \[\text{= 15}\text{.7 cm}\] Therefore, perimeter of semicircle    \[\text{=15}\text{.7 + 10 = 25}\text{.7 cm}\]