inangle
'Tri' is a prefix for angle
A prefix for angle is "anti-."
bi- like bicycle, binary, angle bisector, etc.
Tri
It gets its name from the Greek prefix icosa- meaning 20 and suffix -gon which means angle(s).
Triangles are based on the prefix 'tri', meaning three, and the root word 'angle', so the meaning is plain: 'tri-angle' means three angles, which is what a triangle is (a shape with three angles).
Prefix=IN
The prefix for inadequate is in-. The prefix in- means not.
The prefix for include is in-. This prefix means not.
Yes, prefix does have a prefix. The prefix is pur-.
Demi has no prefix; it IS a prefix.
The prefix is in-. This prefix means not.