8. वृत्तचितीचे वक्रपृष्ठफळ 1980 सेमी असून तळाची त्रिज्या 15 सेमी असल्यास त्या वृत्तचितीची उंची काढा.
(r = = घ्या.)
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Step-by-step explanation:
2 × pi ×rh = 1980
2× (22/7) × 15 × h = 1980
h = 1980 × 7 / 2×22×15 = 33×7 = 231
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