What is an annulus? Pupils first learn about how to create an annulus, then consider how to find the area of such shapes. They then complete a problem set on arc length and areas of sectors.

Concepts

arc length, arcs, area, area of circles, sectors

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Additional Tags

math

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Instructional Ideas

• Bring in an object in the shape of an annulus and have the class determine its area
• Have learners complete problem set as homework

Classroom Considerations

• Learners need to be familiar with arc lengths and areas of sectors of circles (previous lesson)
• The tenth installment of a 23-part module

Pros

• Problem set includes a progression of difficulty
• Teachers will appreciate the indication of mathematical practices
• Resource includes answer key to all guiding questions, as well as worksheets

Cons

• None

Common Core

HSG-C.B.5 MP2 MP4 MP7