Quiz · Grade 3 · Math
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Q1. A rectangle has a length of 8 cm and a width of 3 cm. What is the perimeter of the rectangle?
Answer: 22 cm
Explanation: Perimeter = 2 × (length + width) = 2 × (8 + 3) = 2 × 11 = 22 cm.
Q2. The area of a rectangle is found by adding the length and the width together.
Answer: false
Explanation: Area is found by multiplying length × width, not by adding them. Adding length and width is only part of finding the perimeter.
Q3. A rectangle has a length of 6 cm and a width of 4 cm. What is the area of the rectangle?
Answer: 24 cm²
Explanation: Area = length × width = 6 × 4 = 24 cm².
Q4. Two rectangles can have the same perimeter but different areas.
Answer: true
Explanation: For example, a 5×3 rectangle has a perimeter of 16 and area of 15, while a 6×2 rectangle also has a perimeter of 16 but an area of 12.
Q5. A garden is shaped like a rectangle. It is 9 meters long and 5 meters wide. How much fencing is needed to go all the way around the garden?
Answer: 28 meters
Explanation: Perimeter = 2 × (9 + 5) = 2 × 14 = 28 meters. Fencing covers the perimeter of the garden.
Q6. A square is a special type of rectangle where all four sides are equal in length.
Answer: true
Explanation: A square meets all the requirements of a rectangle (4 right angles, opposite sides equal) and also has all four sides the same length.
Q7. A rectangle has a perimeter of 20 cm and a width of 3 cm. What is the length of the rectangle?
Answer: 7 cm
Explanation: Perimeter = 2 × (length + width), so 20 = 2 × (length + 3). Divide both sides by 2: 10 = length + 3. Length = 10 − 3 = 7 cm.
Q8. If a rectangle has a length of 5 cm and a width of 5 cm, its area is 25 cm² and its perimeter is 20 cm.
Answer: true
Explanation: Area = 5 × 5 = 25 cm². Perimeter = 2 × (5 + 5) = 2 × 10 = 20 cm. Both statements are correct.
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