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Luas permukaan Kerucut = luas selimut = πrs
r = 1/2d = 1/2. 1,4 = 0,7 m
s = sisi miring = √(r²+t²) = √(0,7)²+(2,4)²
= √0,49+5,76
= √6,25
= 2,5 m
Lpermukaan kerucut = π.(0,7) (2,5) = 1,75π
L permukaan tabung = Ka x t tabung
= 2πr.t tabung
= 2π.(0,7)(21-2,4)
= 2π (0,7)(18,6)
= 26,04π
Luas total = 1,75π+26,04π
= 27,79π
= 27,79 (3,14)
= 87,26m²
Biaya = 87,26 x Rp. 15.000
= Rp. 1.308.900
silahkan direcheck prosesnya
sebelum menjadi jawaban akhir