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z tw. pitagorasa mamy:
d kwadrat = c kwadrat + x kwadrat
5 kwadrat = 3 kwadrat + x kwadrat
25 = 9 + x kwadrat
25-9= x kwadrat
x kwadrat = 16 | pierwiastkujemy
x=4 cm.
no zamiast x mozna napisac h bo w koncu wysokosc to symbol h.