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P=20cm
a=4cm
h=?
h=P/a
h=20cm/4cm
h=5cm
Podst. trój. = 4 cm
H = Pole trój. ÷ Podst. trój. × 2
20 ÷ 4 × 2 = 10 cm
Odp: Wysokość ma 10 cm.