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Da VIP Academy / GED / Math / Geometry & Measurement

Perimeter & Area

Find perimeter and area of rectangles, triangles, circles, and composite figures.

Practice this skillAll Math skills

How it works

Core formulas

Rectangle: A = lw, P = 2l + 2w. Triangle: A = ½bh. Circle: A = πr², C = 2πr.

Composite figures

Cut an odd shape into rectangles and triangles, find each area, then add. Subtract when a piece is removed.

Worked examples

  1. A rectangle is 14 ft by 9 ft. Find area and perimeter.

    1. Area = 14 × 9 = 126 sq ft.
    2. Perimeter = 2(14) + 2(9) = 46 ft.

Words to know

Perimeter
Distance around a figure.
Area
Space covered, measured in square units.

Test-day tips

  • • Area answers use square units; perimeter answers do not.
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