Grade DE Circumference of a Circle Recall and

Grade D/E Circumference of a Circle Recall and use the formula for the area & circumference of a circle

Key Vocabulary •

Finding the Circumference of a Circle The circumference of a circle is the distance around the outside. Circumference Radius Diameter x

Finding the Circumference of a Circle - Example

Finding the Circumference of a Circle - Questions A circle has a diameter of 8 cm. Find the circumference of the circle to 1 decimal place. A circle has a radius of 17 cm. Find the circumference of the circle to 1 decimal place.

Finding the Diameter/Radius when given the Circumference - Example

Finding the Diameter/Radius when given the Circumference - Questions A circle has a circumference of 314 cm. Find the diameter to 1 decimal place. A circle has a circumference of 157 cm. Find the radius to 1 decimal place.

Problem Solving and Reasoning Gwen is baking a cake for daughter’s wedding. The cake has 3 tiers with diameters 40, 20 and 10 cm respectively. Gwen needs to buy ribbon for around the cake. It cost 13 p for each 10 cm of ribbon. How much does it cost Gwen to buy the ribbon?

Problem Solving and Reasoning The diameter of Mars is 6, 779 km. The Mars Rover needs to do a complete trip around the planet in 50 days. Calculate the average speed (in km/h) to 1 decimal place that the Mars Rover should travel to successfully complete this mission.