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24.
luas = 2×luas trapesium
luas = 2×{(21+41)÷2×24}
luas = 2×(62÷2×24)
luas = 2×(31×24)
luas = 2×744
luas = 1.488 cm2 (jawaban B)

28.
volume = luas alas × tinggi
volume = (1/2×10×12) cm2 × 200 cm
volume = 60 cm2 × 200 cm
volume = 12.000 cm3
volume = 0,012 m3 (jawaban D)