请问如何证明:如果四面体的内切球与每个面的切点都是这个面的重心,那么这个四面体是正四面体? 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 thesePlatypus, Plumber, Necklace, Robot, Funeral, Seashells, Gourd, Cherry picker, Shorts, Xylophone, 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 #5037 Dolphin by Meen Suksoi


anonymous
anonymous
sketch #1732


anonymous
anonymous
sketch #3572 Hate mondays by Malyi Link


anonymous
anonymous
sketch #5165 Marceline by Marvin Chrome


anonymous
anonymous
sketch #949 jbj


anonymous
anonymous
sketch #3151 Spaceship Nessa Kira Hellsing


anonymous
anonymous
sketch #380


anonymous
anonymous
sketch #5080 Megaman Zero (X) by Muhammad Raiyaan


anonymous
anonymous
sketch #4665 Iron Maiden EDDIE by Jenna Khoùlix�


anonymous
anonymous
sketch #5286 Adventure Time by Manu Kp


anonymous
anonymous
sketch #3736 Why so serious? by Taï Marsan


anonymous
anonymous
sketch #3285 Spongebob by Abbie Hayman


anonymous
anonymous
sketch #3431 Jimi Hendrix by Konvicted Rohit


anonymous
anonymous
sketch #5158 Till Lindemann by Cristina Love


Tom Kelly
sketch #251


anonymous
anonymous
sketch #4722 Ichigo by Gopal Gopi


anonymous
anonymous
sketch #5313 Katy Perry by Monalisa Theresia


anonymous
anonymous
sketch #3339 Sasuke by Jean-Benoit Renaud


anonymous
anonymous
sketch #3088 Billy from Saw by Naulian Ciko


anonymous
anonymous
sketch #5191 The View by Vicente Vera


anonymous
anonymous
sketch #4467


anonymous
anonymous
sketch #1451 mi6softlab vibra


Ariel Fernando
sketch #1061 garota ao vento


anonymous
anonymous
sketch #5193


anonymous
anonymous
sketch #5192


anonymous
anonymous
sketch #3390 Beautiful drawing by Jessie Lightwood


anonymous
anonymous
sketch #4520

tomski请问如何证明:如果四面体的内切球与每个面的切点都是这个面的重心,那么这个四面体是正四面体? 知乎 coloring