Circles (Edexcel IGCSE Maths): Exam Questions

A circle has radius 8.5cm.

Work out the circumference of the circle. Give your answer correct to 3 significant figures.

The diagram shows a shaded shape made from three identical semicircle, $X$, $Y$ and $Z$

$ABCDE$ is a straight line.

$AC$ is the diameter of semicircle $X$and $B$ is the centre of semicircle $X$ $BD$ is the diameter of semicircle $Y$ and $C$is the centre of semicircle $Y$ $CE$ is the diameter of semicircle $Z$ and $D$ is the centre of semicircle $Z$

$AC=BD=CE=20\mathrm{cm}$

Work out the perimeter of the shaded shape. Give your answer correct to the nearest whole number.

A wheel on a tractor has a diameter of 160 cm.

The tractor travels 1750 metres

Work out the number of complete turns made by the wheel. Show your working clearly