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S =1:2.000.000
JP =JS:S
=50.000.000:2.000.000
=25 cm
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Nomor 2
Sisi lengkung kerucut = √5² + 4²
= √25 + 16
= √41
Luas selimut = πrs
= 3,14 x 5 x √41
= 15,7√41
Nomor 3
JPP = Skala / Js
= 1/2.000.000/50.000.000
= 25 cm