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Verified answer
nomer 25alas segitiga = a = 20 cm
tinggi segitiga = t = 1/4 x a
t = 1/4 x 20 cm
t = 5 cm
luas segitiga = 1/2 x a x t
= 1/2 x 20 x 5
= 50 cm²
luas segitiga tersebut adalah 50 cm²