Worked example
A rectangle is 6 cm by 4 cm. What is its perimeter?
Answer & why
Answer: 20
6 + 4 + 6 + 4 = 20 centimeters.
Grade 3 · Math
Find rectangle perimeter
Add all four rectangle side lengths to find distance around it.
8 generated examples + worked example
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8 reproducible examples from this math generator. Choose New examples for another set.
Question 1
A rectangle is 15 cm long and 8 cm wide. What is its perimeter in centimeters?
- 120
- 46
- 44
- 47
A hint
Add all four side lengths.
Answer & why
Answer: 46
Perimeter = 2 × (length + width) = 2 × (15 + 8) = 46 centimeters.
Question 2
A rectangle is 12 cm long and 4 cm wide. What is its perimeter in centimeters?
- 33
- 34
- 32
- 35
A hint
Add all four side lengths.
Answer & why
Answer: 32
Perimeter = 2 × (length + width) = 2 × (12 + 4) = 32 centimeters.
Question 3
A rectangle is 12 cm long and 6 cm wide. What is its perimeter in centimeters?
- 34
- 40
- 35
- 36
A hint
Add all four side lengths.
Answer & why
Answer: 36
Perimeter = 2 × (length + width) = 2 × (12 + 6) = 36 centimeters.
Question 4
A rectangle is 9 cm long and 5 cm wide. What is its perimeter in centimeters?
- 31
- 28
- 45
- 30
A hint
Add all four side lengths.
Answer & why
Answer: 28
Perimeter = 2 × (length + width) = 2 × (9 + 5) = 28 centimeters.
Question 5
A rectangle is 9 cm long and 7 cm wide. What is its perimeter in centimeters?
- 35
- 30
- 32
- 31
A hint
Add all four side lengths.
Answer & why
Answer: 32
Perimeter = 2 × (length + width) = 2 × (9 + 7) = 32 centimeters.
Question 6
A rectangle is 7 cm long and 11 cm wide. What is its perimeter in centimeters?
- 35
- 38
- 36
- 37
A hint
Add all four side lengths.
Answer & why
Answer: 36
Perimeter = 2 × (length + width) = 2 × (7 + 11) = 36 centimeters.
Question 7
A rectangle is 12 cm long and 11 cm wide. What is its perimeter in centimeters?
- 48
- 47
- 46
- 49
A hint
Add all four side lengths.
Answer & why
Answer: 46
Perimeter = 2 × (length + width) = 2 × (12 + 11) = 46 centimeters.
Question 8
A rectangle is 14 cm long and 7 cm wide. What is its perimeter in centimeters?
- 42
- 46
- 45
- 44
A hint
Add all four side lengths.
Answer & why
Answer: 42
Perimeter = 2 × (length + width) = 2 × (14 + 7) = 42 centimeters.