## Area of Rectangles

Area is the measurement indicating how much space on a plane is taken up by a two-dimensional shape. While perimeter is measured in units of length, area is measured in square units. We will discuss units of measurement in more detail in the next section. Watch this lecture series about calculating the area of rectangles, and complete the interactive exercises.

### Counting unit squares to find area formula

Source: Khan Academy, https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry

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