Perimeter and Area — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A square with 4 cm sides has a perimeter of 12 cm.
Corrected: A square with 4 cm sides has a perimeter of 16 cm.
The corrected sentence is: "A square with 4 cm sides has a perimeter of 16 cm.". The original sentence "A square with 4 cm sides has a perimeter of 12 cm." contained an error that needed to be fixed.
2. Fix the sentence:
A rectangle 5 cm by 3 cm has an area of 8 square cm.
Corrected: A rectangle 5 cm by 3 cm has an area of 15 square cm.
The corrected sentence is: "A rectangle 5 cm by 3 cm has an area of 15 square cm.". The original sentence "A rectangle 5 cm by 3 cm has an area of 8 square cm." contained an error that needed to be fixed.
3. Fix the sentence:
The area of a rectangle is 24 cm.
Corrected: The area of a rectangle is 24 square cm.
The corrected sentence is: "The area of a rectangle is 24 square cm.". The original sentence "The area of a rectangle is 24 cm." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A rectangle is 8 cm long and 2 cm wide. Its area is 16 square cm.
Area = 8 × 2 = 16 square cm.
2. Area tells how many square units cover a flat surface.
Area is always measured in square units, such as square centimeters or square meters.
3. A rectangle with sides 3 m and 6 m has a perimeter of 18 m.
Perimeter = 3 + 6 + 3 + 6 = 18 cm.
4. A square with 5 cm sides has a perimeter of 20 cm.
Perimeter = 4 × 5 = 20 cm.
Part C: True or False?
Read each statement. Circle True or False.
1. A square with 4 cm sides has an area of 16 square cm.
True False
True — perimeter = 4 + 3 + 4 + 3 = 14 cm.
2. Perimeter measures the space inside a shape.
True False
False — the area is 6 × 3 = 18 square cm, not 9.
3. A rectangle with sides 9 cm and 1 cm has a perimeter of 20 cm.
True False
True — area of a rectangle = length × width.