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Start Chapter QuizMeasuring Space: Perimeter and Area Mind Map
Use this learning tree to open the right concept in the right order. Start with a branch, expand it, then move into the concept page you need next.
Perimeter of Polygons
highThe perimeter of a polygon is the total length of all its sides.
Always check whether the question asks for boundary length or surface area before choosing a formula.
Circumference of a Circle
highThe circumference of a circle is the length of its curved boundary.
If the answer is boundary length, use 2πr or πd, not πr².
Length of an Arc and Sector Perimeter
highArc length is the length of a part of a circle's circumference, and sector perimeter is the arc length plus two radii.
For sector perimeter, remember to add the two straight radii after finding the arc length.
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