7 सेमी त्रिज्या असणाऱ्या गोलाचे पृष्ठफळ काढा.
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4πr^2 = 4× π × 7×7 ( trijya - 7 cm)
= 4× 22/ 7 × 7 × 7
= 4× 22 × 7
= 88× 7
= 616 chauras cm
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