GED Math Practice Test

What is the measure of the flat surface inside the perimeter of a shape called?

1. Area

2. Denominator

3. Fraction

4. Volume

The correct answer is: Area

The measure of the flat surface inside the perimeter of a shape is called the area. Area quantifies the two-dimensional space that a shape covers. It is typically measured in square units, such as square meters or square feet, and can be calculated using various formulas depending on the shape (for example, length times width for rectangles, or π times radius squared for circles). In contrast, volume refers to the three-dimensional space occupied by an object, which is not relevant when discussing flat surfaces. Denominator pertains to the bottom number in a fraction, which isn't related to measuring surface. A fraction itself represents a part of a whole and doesn’t measure area or surface directly. Thus, area is the term that accurately describes the flat surface inside a shape's perimeter.