railway DFCCIL Executive 2025 Mock Test Quantitative Aptitude Mensuration Solid Figures

एक गोले की त्रिज्या ज्ञात कीजिए, जिसका पृष्ठीय क्षेत्रफल 900 π cm2 है।

1
15 cm
2
12 cm
3
18 cm
4
20 cm
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