The judging conditions and computation of the circumcenter of space triangle are studied.Firstly,three important lemmas about the space triangle are given,then three sufficient and necessary conditions and three neces-sary conditions for judging the circumcenter are given by using the definition of the circumcenter and one proposi-tion.Finally,the calculation formula of the coordinates of the circumcenter of space triangles is given by using the judging conditions,so that students can have a deeper understanding and mastery of the circumcenter of space tri-angle,which provides technical support for the application of space triangle in the field of engineering technology.
space trianglecircumcenterdot productvector productcenter of gravity
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