RRB Group D practice question
Find the curved surface area of a solid hemisphere of radius 28 cm. (Use π = 22/7)
From a RRB Group D Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) 4,928 cm²
Curved surface area of a hemisphere = 2πr². Here r = 28 cm, so CSA = 2 × (22/7) × 28² = 4,928 cm².
हिंदी में प्रश्न
28 सेमी त्रिज्या वाले एक ठोस अर्धगोले का वक्र पृष्ठीय क्षेत्रफल ज्ञात कीजिए। (π = 22/7 का प्रयोग करें)
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सही उत्तर: (C) 4,928 सेमी²
अर्धगोले का वक्र पृष्ठीय क्षेत्रफल = 2πr²। यहाँ r = 28 सेमी, अतः वक्र पृष्ठीय क्षेत्रफल = 2 × (22/7) × 28² = 4,928 सेमी² है।
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