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

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

21 सेमी त्रिज्या वाले एक वृत्ताकार पिज़्ज़ा का 75% भाग खा लिया गया। शेष बचे पिज़्ज़ा का क्षेत्रफल कितना होगा?

A. 173.25 cm²

B. 346.5 cm² ✅

C. 432.25 cm²

D. 115.5 cm²

✅ 346.5 cm²

Remaining pizza:

100\% - 75\% = 25\%

Thus, only

\frac{25}{100}=\frac{1}{4}

of the pizza remains.

अर्थात पिज़्ज़ा का केवल $\frac{1}{4}$ भाग शेष है।

Total area of pizza / पिज़्ज़ा का कुल क्षेत्रफल

\pi r^2

=\frac{22}{7}\times 21 \times 21

=1386\ \text{cm}^2

Remaining area / शेष क्षेत्रफल

\frac{1}{4}\times 1386

=346.5\ \text{cm}^2

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

✅ Correct Answer / सही उत्तर: 346.5 cm²

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