# Finding the Circumference of a Circle

Students learn about finding the circumference of a circle as a multiple of π and as a decimal correct to 3 significant figures.  As learning progresses students are challenged to find the perimeter of semi-circles and sectors.At the start of the lesson students recap finding the perimeter of complex shapes using a right-angled triangle.  The plenary challenges students to apply their learning to a real work problem.
##### Differentiated Learning Objectives
• All students should be able to find the circumference of a circle as a multiple of pi when the diameter is given.
• Most students should be able to find the circumference of a circle to 3 significant figures.
• Some students should be able to calculate the arc length of a sector.

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