elviracr
Luas permukaan tabung = ( tinggi x keliling alas ) + (2 x luas alas ) = ( 12 x pi x diameter ) + ( 2 x pi x r^2) = ( 12 x (22/7) x 14 ) + ( 2 x (22/7) x (14/2)^2 ) = ( 12 x 22 x 14 ) + ( 2 x (22/7) x 7^2 ) = (3696) + ( 2 x 22 x 7 ) = 3696 + 308 = 4004 cm2
Penjelasan dengan langkah-langkah:
d = 14 cm -> r = 7 cm
t = 12 cm
LP = 2πr(r + t)
= 2 . 22/7 . 7 (7 + 12)
= 836 cm²
= ( 12 x pi x diameter ) + ( 2 x pi x r^2)
= ( 12 x (22/7) x 14 ) + ( 2 x (22/7) x (14/2)^2 )
= ( 12 x 22 x 14 ) + ( 2 x (22/7) x 7^2 )
= (3696) + ( 2 x 22 x 7 )
= 3696 + 308
= 4004 cm2