rectangular trihedral angle [数] 直三面角

a trihedral angle 三面角

polar trihedral angle 极三面角

directed trihedral angle 有向三面角

trihedral angle reflector 三面角反射器

isosceles trihedral angle 等腰三面角

synclastic trihedral angle 同向三面角

supplementary trihedral angle 补三面角

birectangular trihedral angle 双直三面角