## Sketch

## Perimeter of a rectangle

**Formula**: 2a 2b = U (circumference)

**Example calculation:** (5cm * 2) (3cm * 2) = 16cm

## Area of a rectangle

**Formula**: a * b = A (area)

Example**calculation:** 5cm * 3cm = ^{15cm2}

Calculating a rectangle typically involves finding its area and perimeter, given its length and width.

1. **area**: The area of a rectangle is calculated by multiplying its length by its width. The formula is therefore: area = length * width. The unit of area is typically square meters (m^2), but can also be expressed in other square units (such as square centimeters, square kilometers, etc.), depending on the given units of measurement.

2. **perimeter**: The perimeter of a rectangle is calculated by adding up the lengths of all the sides. Since a rectangle has two sides of equal length and two sides of equal width, the formula for the perimeter is: perimeter = 2 * length 2 * width. Perimeter is expressed in the same unit of measurement as length and width, usually in meters, but can also be in centimeters, kilometers, etc.

For example, if we have a rectangle with a length of 5 meters and a width of 3 meters, the area would be 15 square meters (5m * 3m) and the perimeter 16 meters (2*5m 2*3m).

These simple formulas are fundamental to many fields, from geometry to architecture and design. However, it is important to remember that they only apply to rectangles that have right angles. For other quadrilaterals, other calculation methods apply.