If we can add three or more numbers together, that can help us in this lesson. Let's try this problem to practice.
Solve 40 + 20 + 3.
This video looks at using the properties of rectangles to calculate the perimeter, it also talks about some special notation that is often used to show when two sides have the same length.
Find the perimeter of the rectangle shown.
selects and uses the appropriate unit and device to measure lengths and distances, calculates perimeters, and converts between units of length