二、几何部分英语术语

all the angles                     所有的角　　                   

vertical angle                     对顶角?

central angle                      圆心角?

interior angle                     内角?

exterior angle                     外角?

acute angle                         锐角?

obtuse angle                       钝角?

right angle                        直角?

round angle                        周角?

straight angle                     平角?

included angle                     夹角??

triangle                           三角形　　

equilateral triangle               等边三角形?

scalene triangle                   不等边三角形?

isosceles triangle                  等腰三角形?

right triangle                     直角三角形?

oblique triangle                   斜三角形?