椭圆的第一定义如何推出第二定义(纯几何,不借助坐标系也不升到三维空间)? 知乎 Template




You need a modern browser try chrome, to view this.

Background image: Hide Show

View Larger Image Image Credit: zhihu.com






Try and sketch some of theseVanity, Garage, Coffin, Geek, Shoehorn, Goldfish, Teacher, Rabbit, Syrup, Scorpion, view more ideas


please wait, the page is loading...

More Sketches

Take a peek at some of the sketches created by our users, are you a sketchite?

anonymous
anonymous
sketch #3639


anonymous
anonymous
sketch #5276


anonymous
anonymous
sketch #1219


anonymous
anonymous
sketch #3166 Axl Rose by Jessie Lightwood


anonymous
anonymous
sketch #5284


anonymous
anonymous
sketch #5228 Rin & Len by Mark Phillips


anonymous
anonymous
sketch #5113 Growlithe and Arcanine by Kervinzitho del Piero


anonymous
anonymous
sketch #3670 Bugs Bunny by Jessica Column


anonymous
anonymous
sketch #3513


anonymous
anonymous
sketch #3439 Aralé by Malyi Link


anonymous
anonymous
sketch #4319


sketchmaster
sketch #2618


anonymous
anonymous
sketch #1168


anonymous
anonymous
sketch #2250 lelouch


sketchmaster
sketch #2639 Marilyn by sketchmaster


anonymous
anonymous
sketch #1477 123 viva l 'algerie


anonymous
anonymous
sketch #5138 Monster by Leonie Cooper


anonymous
anonymous
sketch #3273


anonymous
anonymous
sketch #5171


anonymous
anonymous
sketch #2892 Joker by Frank Aguiar Au


anonymous
anonymous
sketch #894 hmmm


anonymous
anonymous
sketch #3254 derp


anonymous
anonymous
sketch #2926 Power Puff Girls by Sylvie Rieux


anonymous
anonymous
sketch #4368


anonymous
anonymous
sketch #4874 Milla Jovovich by Kimmy Kitty Perry Priemus


anonymous
anonymous
sketch #3604 Falling Manipati Surya


anonymous
anonymous
sketch #5173 Super Meat Boy by Zorka Edding Giustinianovic


anonymous
anonymous
sketch #5261

tomski椭圆的第一定义如何推出第二定义(纯几何,不借助坐标系也不升到三维空间)? 知乎 coloring