прямоугольник АВСD. AD=40, AC=41
по теореме пифагора:CD^2=AC^2-AD^2=1681-1600=81
CD=9
S=CD*AD=9*40=360
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прямоугольник АВСD. AD=40, AC=41
по теореме пифагора:CD^2=AC^2-AD^2=1681-1600=81
CD=9
S=CD*AD=9*40=360