解题思路：利用三角形的内角和为180°，得到x+2x+3x=180°，解得x=30°，即可得到3x．
∵三角形的内角和为180°，
∴x+2x+3x=180°，
解得x=30°，
所以3x=90°．
故选C．
点评：
本题考点： 三角形内角和定理．
考点点评： 本题考查了三角形的内角和定理：三角形的内角和为180°．
In a triangle，if measures of three&
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