It means Father, Son, and Holy Spirit. Kind of like the cross.
It is the bond between God, His Son and the Holy Spirit.
It means 3 angles that can be found in a triangle.
Unless it is a religious triangle it does not have to have any angels! Seriously, though, a triangle does not have to have a 90 degree angle. In terms of its angles, the only requirement is that the measures of the three angles adds to 180 degrees (or pi radians).
No, the words "nativity" and "scene" are not in themselves religious terms. Look them up on the dictionary and see what they mean.
a right triangle
To conclude, or deduce, as in, "from the fact that the triangle is equilateral, and the fact that a triangle is isoceles if and only if the base angles are equal, we can infer that it is also equiangular."
It means to be responsible and guide things in a good and proper direction and to not be wasteful.
Dated, or old terms.
The answer depends on what you mean by "mean of triangle". There is no such geometric term.
If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.
Triangle-ception.
There is no anagram for relating in mathematical terms.
Three and polygon.