Standard Mathematics Primary 6 Circles

A square has a side of 10 cm. A quarter circle with radius 10 cm is drawn inside the square with its centre at one corner. What is the area of the shaded region that is inside the square but outside the quarter circle? (Use π = 3.14)

A 21.5 cm²
B 78.5 cm²
C 100 cm²
D 314 cm²
Show Worked Solution

Worked Solution

Step 1: Area of square = side × side = 10 × 10 = 100 cm². Step 2: Area of quarter circle = ¼ × πr² = ¼ × 3.14 × 10² = ¼ × 314 = 78.5 cm². Step 3: Shaded area = area of square − area of quarter circle = 100 − 78.5 = 21.5 cm². Answer: 21.5 cm²

Correct answer: 21.5 cm²

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