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

Question

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

1. A. 173.25 cm²
2. B. 346.36 cm² (Correct answer)
3. C. 432.25 cm²
4. D. 115.5 cm²

Correct Answer

Option B — 346.36 cm²

Detailed Solution & Explanation

The correct answer is 346.36 cm².

Key Points

• Full area = π × 21² ≈ 3.14159 × 441 ≈ 1385.44 cm².
• If 75% is eaten, 25% remains: 1385.44 × 0.25 ≈ 346.36 cm².
• The fraction eaten applies to the whole area, so compute the total circle area once, then take the leftover fraction — here a quarter.