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1.232 = 1/3 22/7 7² t
1.232 = 51,3 t
t = 24
s² = r² + t²
s² = 7² + 24²
s² = 49 + 576
s² = 625
s = √625 = 25
Lselimut = π r s
= 22/7 7 25
= 22 × 25
= 550 cm²