Brachistochrone

全部GIF贴纸表情包
two men are standing next to each other in a room and playing with a toy .
a blue and red line on a white background shows a curve
two men are standing next to each other in front of a machine .
a diagram of a braquistocorona with a blue triangle and a red curve
a man with glasses is standing next to another man with glasses
two men are playing with a toy that looks like a skateboard
two men are playing with a toy that looks like a skateboard