Perimeter & CircumferenceATI TEAS 7 cheat sheet

Distance around the outside

9 key facts 5 practice questions Reviewed Oct 2026

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Perimeter

Add every side
Rectangle: P = 2l + 2w
Square: P = 4s
Triangle: add all three sides

Circumference

C = 2πr or C = πd
Use π ≈ 3.14 unless told otherwise
Diameter = twice the radius

Composite Shapes

Trace the outside edge only — interior lines are not part of the perimeter

Units

Perimeter is a length — cm, in, m — never squared

Key takeaway

Distance around the outside

Before you read

Test yourself first: 5 questions

Question 1 of 5

What is the circumference of a circle with a radius of 5 (use π ≈ 3.14)?

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