6 सेमी त्रिज्या असलेल्या एका वर्तुळपाकळीचे क्षेत्रफळ 15T सेमी' आहे, तर त्या पाकळीच्या
कंसाचे माप काढा व वर्तुळकंसाची लांबी काढा.
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Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called ... The largest consumer and importer of coal is China.
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