BKSB Measurement and Area 3 — Questions and Answers
Question 1: A circle has a radius of 7 cm. What is its area? (Use π ≈ 3.14)
- 43.96 cm²
- 153.86 cm² (Correct answer)
- 44 cm²
- 307.72 cm²
Correct answer: 153.86 cm²
Area = π × r² = 3.14 × 7² = 3.14 × 49 = 153.86 cm².
Question 2: Convert 5 pounds to kilograms. (1 kg ≈ 2.2 lbs)
- 11 kg
- 2.27 kg (Correct answer)
- 0.44 kg
- 3.2 kg
Correct answer: 2.27 kg
5 ÷ 2.2 ≈ 2.27 kg.
Question 3: A path 2 m wide runs around the outside of a 10 m × 6 m lawn. What is the area of the path alone?
- 96 m²
- 80 m² (Correct answer)
- 60 m²
- 36 m²
Correct answer: 80 m²
Outer rectangle = (10+4) × (6+4) = 14 × 10 = 140 m²; lawn = 60 m²; path = 140 − 60 = 80 m².
Question 4: How many centimeters are in 2.5 meters?
- 25 cm
- 250 cm (Correct answer)
- 2500 cm
- 0.25 cm
Correct answer: 250 cm
1 meter = 100 cm, so 2.5 m × 100 = 250 cm.
Question 5: A trapezoid has parallel sides of 8 cm and 12 cm, with a height of 5 cm. What is its area?
- 50 cm² (Correct answer)
- 100 cm²
- 40 cm²
- 60 cm²
Correct answer: 50 cm²
Area = ½ × (a + b) × h = ½ × (8 + 12) × 5 = ½ × 20 × 5 = 50 cm².
Question 6: A storage container holds 3,500 mL of liquid. How many liters is that?
- 35 L
- 350 L
- 3.5 L (Correct answer)
- 0.35 L
Correct answer: 3.5 L
1 L = 1,000 mL, so 3,500 ÷ 1,000 = 3.5 L.
Question 7: The area of a square is 64 cm². What is the length of one side?
- 16 cm
- 32 cm
- 8 cm (Correct answer)
- 4 cm
Correct answer: 8 cm
Side = √64 = 8 cm.
BKSB Measurement and Area 3
A circle has a radius of 7 cm.
What is its area? (Use π ≈ 3.14)