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→ 2 x pi x r x ( r + t )
→ 2 x 22/7 x 21 x ( 21 + 126 )
→ 132 x 147
→ 19404cm²
Volume tabung
→ pi x r² x t
→ 22/7 x 21 x 21 x 126
→ 1386 x 126
→ 174636cm^3
Gud Luck❤