Úloha ID 64 - 
Výška daného roatčního válce se zmenšila na svou čtvrtinu. Pro zachování velikosti jeho objemu je třeba poloměr podstavy zvětšit o:
Správná odpověď je: D
Aby zůstal zachován objem, musí být podstava 4x větší (3,14 * poloměr^2 * výška), pí je konstanta a tak musíme pracovat s poloměrem. Aby bylo (x*r)^2 = 4r, musí být x = 2.
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