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Jawabannya:Terlebih dahulu cari garis pelukisnya:
S= 1/2. d
S= 1/2. 40
S= 20 cm
maka:
L.Setengah Lingkaran =L.Selimut Kerucut
πr² = πrs
1/2. 20² = r. 20
1/2. 400 =r. 20
200= 20. r
r= 200/20
r= 10 cm
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