Chapter 1
Chapter 1 Basic Math
Course: Ged Test Prep
Subject: Mathematics
Chapter: Chapter 2 Geometry
Area and perimeter of two-dimensional shapes
The area of a two-dimensional shape is the amount of space inside the shape, measured in square units. The formulas to calculate the area of common shapes are different. For example, the area of a square is calculated by side length squared, while the area of a circle is calculated by πr² (pi times the radius squared).
The perimeter of a two-dimensional shape is the distance around the shape, which is the sum of the lengths of all its sides. The formulas to calculate the perimeter of common shapes differ as well. For example, the perimeter of a rectangle is calculated by 2(length + width), while the perimeter of a circle is calculated by 2πr (2 times pi times the radius).
Example 1
Example 2