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= 2 π r t
= 2. (22/7) . 3 . 3,5
=66 m2
panjang garis pelukis (s)
s= √3^2+4^2
s= √25
s= 5
luas selimut kerucut
= π r s
= (22/7).3.5
=47,14
luas permukaan tenda
= 66+47,14
=113,14
biaya nya
113,14 x 20.000
2.262.000