Find Rectangle Perimeter

Supplied materials

• Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
• Supplied worked-case record: A rectangle is 8 cm by 3 cm.
• All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.

Learn the idea

Perimeter is the distance all the way around a figure. A rectangle has two copies of its length and two of its width. Add those four boundary lengths or double their sum. Multiplying length by width gives area, which answers a different question.

List the four supplied rectangle sides in order around the boundary. Add them and report length units. Check using twice the sum of one length and one width, and contrast the area calculation.

Trace the complete outside boundary once. A rectangle has two sides of each given dimension. Label each of four sides and follow a loop around the outside.

1. Label each of four sides and follow a loop around the outside.
2. Follow the worked example. Point to each number or shape feature and say what it tells you.
3. List the four supplied rectangle sides in order around the boundary.
4. Try the question and then the three practice questions. Check your answers and explain any change you make.

Check your reasoning

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Take it further

A 9 cm by 4 cm rectangle has perimeter 26 cm.

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