Perimeter and Area — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A notebook is 11 cm long and 8 cm wide. Its perimeter is 38 cm.
Add all four sides: 11 + 8 + 11 + 8 = 38 cm.
2. A square placemat has 6-inch sides. Its area is 36 square inches.
A square's area is side x side, so 6 x 6 = 36 square inches.
3. A door is 7 feet tall and 3 feet wide. Its area is 21 square feet.
Area = length x width, so 7 x 3 = 21 square feet.
4. A whiteboard is 12 m long and 4 m wide. Its perimeter is 32 m.
Add all four sides: 12 + 4 + 12 + 4 = 32 m.
5. A square window has 5 m sides. Its perimeter is 20 m.
A square has 4 equal sides, so 4 x 5 = 20 m.
6. A towel is 8 feet long and 4 feet wide. Its area is 32 square feet.
Area = length x width, so 8 x 4 = 32 square feet.
7. A stamp is 3 cm by 2 cm. Its perimeter is 10 cm.
Add all four sides: 3 + 2 + 3 + 2 = 10 cm.
8. A square tile is 10 inches on each side. Its area is 100 square inches.
A square's area is side x side, so 10 x 10 = 100 square inches.
9. A rectangle is 9 m long and 7 m wide. Its perimeter is 32 m.
Add all four sides: 9 + 7 + 9 + 7 = 32 m.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Rectangle 5 cm × 4 cm area
→ 20 square cm
22 cm
Square 6 cm perimeter
→ 24 cm
81 square cm
Rectangle 8 cm × 3 cm perimeter
→ 22 cm
20 square cm
Square 9 cm area
→ 81 square cm
24 cm
Correct matches: Rectangle 5 cm × 4 cm area → 20 square cm; Square 6 cm perimeter → 24 cm; Rectangle 8 cm × 3 cm perimeter → 22 cm; Square 9 cm area → 81 square cm.