Circumference and area of circles

Front

Which of the following diagrams shows the radius of a circle?

Back

Front

Correct formula for finding the circumference of a circle?

Back

Front

Calculate the area of a circle using π = 3.142.

Back

28.278 cm²

Front

Calculate the circumference of the circle, leaving your answer in terms of π.

Back

24π cm

Front

The circumference of a circle is 40cm. What is its diameter to 1 decimal place?

Back

12.7 cm

Front

What is the area of this circle to 1 decimal place?

Back

113.1 cm²

Front

A circle has an area of 16π. Which of the following is the correct calculation for working out the circle's radius?

Back

Front

Calculate the area of the semicircle. Round your answer to 2 decimal places.

Back

95.57 cm²

Front

Two semi-circles are placed next to each other in the design shown. What is the total perimeter of the shape?

Back

Front

Calculate the area of the minor (smaller) sector of the circle. Leave your answer in terms of π.

Back