Bézier triangle
A Bézier triangle is a special type of Bézier surface that is created by (linear, quadratic, cubic or higher degree) interpolation of control points. == nth-order Bézier triangle == A general nth-order Bézier triangle has (n +1)(n + 2)/2 control points αiβjγk where i, j, k are non-negative integers such that i + j + k = n.