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Area of a circle – KS3 maths lesson plan
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When a goat is tethered to a shed, how much of the surrounding area can they reach? Colin Foster explains how this is a rich scenario for exploring circle area calculations…
In this lesson, students consider the parts of a field a goat can reach if it is tethered to the corner of a shed.
The region of grass the goat can access depends on the length of the rope; as the rope gets longer and begins to snag on the corners of the shed, students will need to think hard in order to work out the locus and calculate the total area of accessible grass.
This lesson applies students’ knowledge of loci and the area of a circle to solve a problem involving a tethered goat.
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