liczymy z pitagorasa
15 ² - 9 ² = 225 - 81 = 144, V144 to 12
obwd - 10+10+12+12+15 = 59
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liczymy z pitagorasa
15 ² - 9 ² = 225 - 81 = 144, V144 to 12
obwd - 10+10+12+12+15 = 59