Foundation Mathematics Primary 6 Circles

In the school garden, a semicircular flower bed has a diameter of 14 m. Find the area of the flower bed. (Take π = 22/7.)

A 38.5 m²
B 49 m²
C 77 m²
D 154 m²
Show Worked Solution

Worked Solution

Step 1: Find the radius. r = diameter ÷ 2 = 14 ÷ 2 = 7 m. Step 2: Use the semicircle area formula: A = ½ × π × r × r. Step 3: Substitute. A = ½ × 22/7 × 7 × 7. Step 4: Simplify. 22/7 × 7 × 7 = 22 × 7 = 154 m². Step 5: Halve. A = 154 ÷ 2 = 77 m². Answer: 77 m². Answer: 77 m²

Correct answer: 77 m²

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