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