锐角：acute angle
钝角：obtuse angle
直角：right angle
等角的：equiangular
三角形的：triangular
有两角的：biangular
多角的：multi-angular
五角的：pentangular
直角的：rectangular, right-angular
八角的：octangular
底角：bottom corner
嘴角：mouth corner
眼角：eye corner
角铁，角钢：angle iron
攻角，冲角：angle of attack
俯角：angle of depression
仰角：angle of elevation
摩擦角：angle of friction
入射角：angle of incidence
反射角：angle of reflection
折射角：angle of refraction
休止角：angle of repose
视角：angle of view
