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t - a = 5
a) alas = 2 × 5 cm
3-2
= 2/1 × 5 cm
= 10 cm
tinggi = 3 × 5 cm
3-2
= 15 cm
b) L Δ = 1/2 × a × t
= 1/2 × 10 × 15 cm²
= 75 cm²