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maaf klo slh
Atau bisa
2 ( π r²) + ( 2 π r t )
2 ( 3.14 x 20 x 20 ) + ( 2 x 3.14 x 20 x 15 )
2 ( 1256 ) + ( 2 x 942 )
2512 + 1884
4.386 CM ²