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 theseScarf, Chimes, Comet, Dessert cart, Trigger, Road, Gauntlets, Backpack, Bulldozer, Squid, 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 #314 Butterfly


anonymous
anonymous
sketch #3063


Sam Torres
sketch #2806 Puppy love by Sam Torres


sketchmaster
sketch #2608 Beauty and the Beast by sketchmaster


anonymous
anonymous
sketch #4385


anonymous
anonymous
sketch #1923 12


Cherie N Patanao
sketch #1043 Deadoo..


anonymous
anonymous
sketch #5278 Cosmos by Jenna Khoùlix�


anonymous
anonymous
sketch #5100 Shadow by An Nguyen


anonymous
anonymous
sketch #2279 puppetsss


anonymous
anonymous
sketch #21085 Tobirama by Enrique L. Manly


anonymous
anonymous
sketch #1118 easy zombie


anonymous
anonymous
sketch #4972


anonymous
anonymous
sketch #4086 2lips


anonymous
anonymous
sketch #4232 Tobirama by Kadi Kader


Donara Smbatyan
sketch #1448 donara


anonymous
anonymous
sketch #5070 The Rolling Stones by Roby Krdoso


anonymous
anonymous
sketch #1095


anonymous
anonymous
sketch #2910 Harley Quinn Germaine Hoens


anonymous
anonymous
sketch #5074


anonymous
anonymous
sketch #846 cat fridayz z z zzzz zz


anonymous
anonymous
sketch #5066 Rey Helado by Gleny Acevedo


anonymous
anonymous
sketch #3059


Tom Kelly
sketch #15


anonymous
anonymous
sketch #4424 MJ by Nycole Prietsch


Ariel Fernando
sketch #1061 garota ao vento


anonymous
anonymous
sketch #5311


Helyryn
sketch #293 jdjdjdjdj


anonymous
anonymous
sketch #3133 Skrillex by Asfa Sajid


anonymous
anonymous
sketch #5351

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