3
A right triangle has 3 corners, or vertices.
A scalene (not scaline) triangle (not traingle) has three corners.
A triangle has 3 sides (or edges) and 3 corners (or angles)
a triangle pyramid has 5 corners
Six.
4
it has 4
3
A triangle consists of three corners and three edges.
3 because of the corners.
if it does have corners its not a triangle
It has 4 corners.