Measurement and Data: Recognizing Quadrilaterals and Their Attributes (CCSS.3.MD.8)
Common Core 3rd Grade Math · Learn by Concept
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Common Core 3rd Grade Math › Measurement and Data: Recognizing Quadrilaterals and Their Attributes (CCSS.3.MD.8)
A rectangle is 7 units long and 4 units wide. What is the perimeter of the rectangle?
28 units
18 units
22 units
22 square units
Explanation
Perimeter is the distance around the outside. Add all sides: 7 + 4 + 7 + 4 = 22 units. Area (28) and square units do not match the question.
A rectangle has a perimeter of 26 units. The length is 8 units. What is the width?
5 units
18 units
13 units
40 square units
Explanation
Use perimeter: 2 × (length + width) = 26, so length + width = 13. Then 13 − 8 = 5 units. Do not use area or square units for this fencing-type problem.
Mia is putting a fence around a small triangular play area. She needs to know how much fencing to buy. Which measurement helps solve this situation?
Area
Both perimeter and area
Neither
Perimeter
Explanation
Fencing measures the distance around the outside, which is perimeter. Area would measure the space inside and would not tell how much fence to buy.