Question
Download Solution PDF21 सेमी व्यास वाले एक गोले का पृष्ठीय क्षेत्रफल (सेमी2 में) ज्ञात कीजिए।
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFदिया गया है:
गोले का व्यास = 21 सेमी
प्रयुक्त सूत्र:
गोले का पृष्ठीय क्षेत्रफल = 4πr2
जहाँ, r = गोले की त्रिज्या
गणना:
त्रिज्या (r) = व्यास ÷ 2
⇒ r = 21 ÷ 2 = 10.5 सेमी
पृष्ठीय क्षेत्रफल = 4 × π × r2
⇒ पृष्ठीय क्षेत्रफल = 4 × 22/7 × (10.5)2
⇒ पृष्ठीय क्षेत्रफल = 1386 सेमी2
इसलिए, सही उत्तर विकल्प (3) है।
Last updated on Jul 8, 2025
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