Pre-AlgebraArea & Perimeter
Area & Perimeter
Learn how to calculate the area and perimeter of various geometric shapes.
Basic Formulas
Rectangle
- Area = length × width
- Perimeter = 2(length + width)
Square
- Area = side²
- Perimeter = 4 × side
Triangle
- Area = ½ × base × height
- Perimeter = sum of all sides
Circle
- Area = πr²
- Circumference (perimeter) = 2πr
Parallelogram
- Area = base × height
- Perimeter = 2(base + side)
Trapezoid
- Area = ½(a + b)h, where a and b are parallel sides and h is height
- Perimeter = sum of all sides
Practice Problems
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Quick Tips
- Area is measured in square units (e.g., square feet, square meters).
- Perimeter is measured in linear units (e.g., feet, meters).
- For irregular shapes, break them down into simpler shapes.