tolong yaa kakak........................... yg no. 2 aja yg dijawab

Diameter = 4,9 m
r = D/2 = 4,9/2 = 2,45 m

Luas permukaan setengah bola = 2.π.r²
L = 2 x 22/7 x 2,45 x 2,45
L = 2 x 22 x 0,35 x 2,45
L = 44 x 0,8575
L = 37,73 m²

Biaya pengecatan
37,73 m² x Rp. 575.000 = Rp. 21.694.750