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28.
Lp = 2 (pl + pt + lt)
Lp = 2 ((20x15) + (20x10) + (15x10))
Lp = 2 (300 + 200 + 150)
Lp = 2 (650)
Lp = 1300 cm^2 (A)
29.
V = Luas alas x tinggi
V = πr^2 x tinggi
V = 3,14 x 20^2 x 68
V = 3,14 x 400 x 68
V = 85.408 cm^3(D)