Question

A circular pizza having a radius of 21 cm. If 75% of it is eaten, what is the area of pizza remaining?

• A. 173.25 cm²
• B. 346.5 cm²
• C. 432.25 cm²
• D. 115.5 cm²

Answer 1

Answer:

B. 346.5 cm²

Total area

$\text{Area} = \frac{22}{7} \times 21 \times 21 = \frac{22}{7} \times 441 = 22 \times 63 = 1386 \text{ cm}^2$

Remaining area (25%)

$\frac{25}{100} \times 1386 = \frac{1}{4} \times 1386 = 346.5 \text{ cm}^2$

Final Answer:

$\boxed{346.5 \text{ cm}^2}$