Area measures the surface inside a shape (in square units); perimeter measures the distance around it.
Area is the amount of space inside a 2D shape. Perimeter is the total length of the shape's boundary.
| Shape | Area | Perimeter |
|---|---|---|
| Rectangle | length Γ width | 2(length + width) |
| Triangle | Β½ Γ base Γ height | a + b + c |
| Circle | Ο Γ rΒ² | 2Οr |
| Trapezoid | Β½(a + b) Γ h | a + b + c + d |
Area is used for flooring, painting walls, and lot sizes. Perimeter is used for fencing, trim, and borders.
A number expressed as a fraction of 100, used to describe proportions and rates of change.
A measure of the spread or dispersion of a data set from its mean (average).
Three measures of central tendency used to describe the center of a data set.
A fundamental relation in geometry: the square of the hypotenuse equals the sum of squares of the other two sides.
A number representing a part of a whole, written as a numerator over a denominator.
The inverse of exponentiation β the logarithm of a number tells you the exponent needed to produce that number from a given base.