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Keliling = 2 x x r
31,4 = 2 x 3,14 x r
31,4 = 6,28 x r
r = 31,4 : 6,28
r = 5 cm
s = 13 cm
t =
t =
t =
t =
t = 12 cm
garis pelukis(s)=13 cm
keliling alas=31,4cm
πd=31,4
d=31,4/3,14
d=10
r =5cm
tinggi kerucut=√s²-r²
=√13²-5²
=√169-25
=√144
=12
jadi,tinggi kerucut tersebut adalah 12 cm