BKSB Measurement and Area 3

Question 1

A circle has a radius of 7 cm. What is its area? (Use π ≈ 3.14)

Accepted Answer

153.86 cm²

Answer

Area = π × r² = 3.14 × 7² = 3.14 × 49 = 153.86 cm².

Question 2

Convert 5 pounds to kilograms. (1 kg ≈ 2.2 lbs)

Accepted Answer

2.27 kg

Answer

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?

Accepted Answer

80 m²

Answer

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?

Accepted Answer

250 cm

Answer

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?

Accepted Answer

50 cm²

Answer

Area = ½ × (a + b) × h = ½ × (8 + 12) × 5 = ½ × 20 × 5 = 50 cm².

(BKSB) Basic and Key Skills Builder Practice Test