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b.lp=3.14*9 (9+ pelukis yg tadi )
c.1/3*3.14*9*9*12
jaqabannya itung sendiri males ngitunh aku ;)
s = 13 < dari triper phytagoras
b. l.p.k = πr(r+s)
3,14 × 9 (9+13)
28,26 × 22
621,72
c. v.k =1/3πr²t
1/3×3,14×9²×12
4×3,14×81
1017.36
maaf klo salah