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= 2 . 3,14 . 20^2
= 2512 m^2
biaya = 2512 x 30000
= 75360000
L bola = 1/2 x 4 x phi x r² = 2 x phi x r²
L bola = 2 x 3,14 x 20²
L bola = 6,28 x 400
L bola = 2.512 m²
Dana ut mengecat kubah = 2.512 x 30.000
= 75.360.000