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 theseGecko, Whip, Pickle, Wench, Merman, Breakfast, Rowboat, Snowplow, Compass, Whisky, 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 #2393


anonymous
anonymous
sketch #5293


Sam Torres
sketch #2806 Puppy love by Sam Torres


anonymous
anonymous
sketch #4987


anonymous
anonymous
sketch #5268 Harley Quinn by 조바다


anonymous
anonymous
sketch #4901 Adventure Time by Louisette Alain


anonymous
anonymous
sketch #5214 Crying with a Smile by Bill Kody


Loai Issa
sketch #2668 Butterfly by Loai Issa


anonymous
anonymous
sketch #1168


anonymous
anonymous
sketch #132


anonymous
anonymous
sketch #3118 Joker Hernan Da Costa Marquez


Na Ruro
sketch #2797 Homer by Na Ruro


anonymous
anonymous
sketch #5040 Amy Winehouse by Timothy Palfreyman


anonymous
anonymous
sketch #4970


anonymous
anonymous
sketch #3479


anonymous
anonymous
sketch #5139 Sick Sick Six Urs Stefan


anonymous
anonymous
sketch #4975 Orange by Marcos Roberto Molina


Cristina Love
sketch #2788 Yuno Gasai from Mirai Nikki by Cristina Love


anonymous
anonymous
sketch #4300 República, comunismo, libertad


anonymous
anonymous
sketch #2560


anonymous
anonymous
sketch #3457


anonymous
anonymous
sketch #3484 Red Hot Chili Peppers by Nik Zulqarnain


anonymous
anonymous
sketch #3562 Angry by Leon Soria Ricardo


anonymous
anonymous
sketch #5054 Angelina Jolie by Hailey So Pretty


anonymous
anonymous
sketch #4368


anonymous
anonymous
sketch #4589


anonymous
anonymous
sketch #3337 Uryuu Minene by Michael Angcay


anonymous
anonymous
sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )


anonymous
anonymous
sketch #5087

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