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= 200 × πr³
= 200× 22/7 .0,7.0,7.0,7
= 2×22/7.7.7.0,7
=2×22.7.0,7
= 44×4,9
=215,6 cm³
215,6 × 7,8 karna 1cm³ = 7,8 gram
= 1681,68 N