Area Formulas

$$A = lw$$ where A is the area, l is the length, and w is the width.

$$A = \frac{1}{2}bh$$ where A is the area, b is the base, and h is the height.

$$A = \left(\frac{b_1 + b_2}{2}\right)h$$ where A is the area, b_1 and b_2 are the lengths of the two parallel sides, and h is the height.

Square units (e.g., square meters, square centimeters).

$$A = s^2$$ where A is the area and s is the length of a side.

The inside of a shape.

$$A = \pi r^2$$ where A is the area and r is the radius.

$$A = bh$$ where A is the area, b is the base, and h is the height.

$$A = \frac{1}{2}d_1d_2$$ where A is the area and d_1 and d_2 are the lengths of the diagonals.

Area measures the space inside a shape, while perimeter measures the distance around a shape.