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jari-jari lingkaran alas 6cm
luas selimut phi.r.s
3.14x3x10 = 94.2 cm²
dit : r & Luas selimut kerucut
jawab:
r²=10²-8²
r=√36
r=6 cm
Luas selimut kerucut = rs
L=3,14.6.10
L=18,84.10
L=188,4 cm²