过焦点弦端点的切线互相垂直并且交点在准线上,这个要怎么证明? 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 theseClown, Dam, Refugee, Teapot, Rose, Messenger Bag, Sailor, Skateboard, Acrobat, Golfer, 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 #5368


anonymous
anonymous
sketch #5071 Rihanna by Johan Kennet Espinoza Moreno


anonymous
anonymous
sketch #3459 BLUE from fosters imagenary friends


anonymous
anonymous
sketch #3413 Link by Dã Tr� ng


anonymous
anonymous
sketch #3383


anonymous
anonymous
sketch #4907


anonymous
anonymous
sketch #3083 Great illustration Ali Hänel


anonymous
anonymous
sketch #5216 D by Gabriela Segura


anonymous
anonymous
sketch #5083


anonymous
anonymous
sketch #970 Depression


anonymous
anonymous
sketch #4310 robot


anonymous
anonymous
sketch #3760 PSY by Juvenilia Alexandrino


anonymous
anonymous
sketch #1853 scribble


anonymous
anonymous
sketch #312


anonymous
anonymous
sketch #4558


anonymous
anonymous
sketch #3285 Spongebob by Abbie Hayman


anonymous
anonymous
sketch #1446


sketchmaster
sketch #2619 Underwater by sketchmaster


anonymous
anonymous
sketch #5211


anonymous
anonymous
sketch #4511 Yao Ming by Betty Marie Melzer


anonymous
anonymous
sketch #3532 Angel by Geneval Mendes


anonymous
anonymous
sketch #2453 Koi Fish


anonymous
anonymous
sketch #5236 Edward Scissorhands by Ronin Ronin


anonymous
anonymous
sketch #578 Butterflies


anonymous
anonymous
sketch #1232 Dylan Thomas


sketchmaster
sketch #2638 Cliff cool

tomski过焦点弦端点的切线互相垂直并且交点在准线上,这个要怎么证明? 知乎 coloring