Area and perimeter of rectangles

In this lesson, we will learn:

• The basic properties of the shape of the rectangle
• How to understand and calculate the perimeter of a rectangle
• How to understand and calculate the area of a rectangle

Notes:

• A rectangle is a 2D (two-dimensional) shape with 4 straight sides and 4 right angles (90°)
• Each pair of sides (across from each other) are the exact same length

• A square is a special type of rectangle where all side lengths are the same

• The perimeter is the exact distance around the shape.
• Perimeter is a 1D (one-dimensional) quantity
• It uses units such as meters (m, cm, mm, km), miles (mi), yards (yd), or inches and feet (in and ft)


• For rectangles, the formula is written as:
• P_rectangle = $(2 \, \times \, l) + (2 \, \times \, w)$
• Where $l$ is length, and w is width


• For squares, the formula is written as:
• P_rectangle = $4 \, \times \, s$
• Where $s$ is side length


• The area is the space that is covered by the shape.
• Area is a 2D (two-dimensional) quantity
• It uses squared units such as square meters (m², cm², mm², km²), square miles (mi²), square yards (yd²), or square inches and feet (in² and ft²)


• For rectangles, the formula is written as:
• A_rectangle = $l \, \times \, w$
• Where $l$ is length, and w is width


• For squares, the formula is written as:
• A_square = $s \, \times \, s \, = \, S^{2}$
• Where $s$ is side length