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SAT Math: Find the area of a sector or length of an arc
18+ practice questions in Praczo
What you need to know
The concept, explained
- 1
Area of a rectangle = length × width. Area of a square = side². Units are always squared (in², cm²).
- 2
Perimeter is different from area: perimeter = 2(length + width) for a rectangle, 4 · side for a square.
- 3
For composite rectangular shapes, break the figure into non-overlapping rectangles, compute each area, and sum.
- 4
When only a diagonal or one side is given, use the Pythagorean theorem or properties of the figure to find the missing dimension.
Common mistakes
- ✗ Confusing perimeter and area — they're different quantities with different units.
- ✗ Forgetting to square the unit when reporting area.
Try a sample question
SAT-style practice
A rectangular garden measures 12 m by 8 m. What is the area of the garden?
18+ questions ready to practice
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