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Calculate the perimeter of rectangles and other polygons · Grade 4 · E2.1

Name: ______________________

Date: ______________________

1
A rectangle is 7 cm wide and 8 cm tall. What is its perimeter, in centimetres?
Warm-up
Answer:
2
A rectangle is 2 cm wide and 6 cm tall. What is its perimeter, in centimetres?
Warm-up
Answer:
3
A rectangle is 3 cm wide and 5 cm tall. What is its perimeter, in centimetres?
Warm-up
Answer:
4
A rectangle is 10 cm wide and 14 cm tall. What is its perimeter, in centimetres?
On level
Answer:
5
A rectangle is 13 cm wide and 21 cm tall. What is its perimeter, in centimetres?
On level
Answer:
6
A rectangle is 25 cm wide and 21 cm tall. What is its perimeter, in centimetres?
On level
Answer:
7
A regular octagon has 8 equal sides. Each side is 12 cm long. What is its perimeter, in centimetres?
Challenge
Answer:
8
A regular octagon has 8 equal sides. Each side is 35 cm long. What is its perimeter, in centimetres?
Challenge
Answer:
9
A regular pentagon has 5 equal sides. Each side is 18 cm long. What is its perimeter, in centimetres?
Challenge
Answer:

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Worksheet code: eyJzIjoic3BhdGlhbC1wZXJpbWV0ZXItcmVjdGFuZ2xlIiwiZCI6WzIxMDUzODg2MTUsMjgxOTM3MzgxLDE0MTU1NjYxOTUsNzA0NjYxMjEyLDY4ODMxNTU2NiwyMTI5NTE3MzA2LDE1NTgzMDIyMjksMTk4MjAwNTY3MSwyMDQ4OTI5MTg0XSwidiI6MX0.c6c26f239dff

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Answer key · Calculate the perimeter of rectangles and other polygons

1.
30 — Perimeter = 2 × (width + height) = 2 × (7 + 8) = 30.
2.
16 — Perimeter = 2 × (width + height) = 2 × (2 + 6) = 16.
3.
16 — Perimeter = 2 × (width + height) = 2 × (3 + 5) = 16.
4.
48 — Perimeter = 2 × (width + height) = 2 × (10 + 14) = 48.
5.
68 — Perimeter = 2 × (width + height) = 2 × (13 + 21) = 68.
6.
92 — Perimeter = 2 × (width + height) = 2 × (25 + 21) = 92.
7.
96 — Perimeter = number of sides × side length = 8 × 12 = 96.
8.
280 — Perimeter = number of sides × side length = 8 × 35 = 280.
9.
90 — Perimeter = number of sides × side length = 5 × 18 = 90.