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Cartesian Isometric

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

The graph below is a coordinate system based on $60$ $^\circ$ angles. It was drawn on isometric paper.

The marked points are $(6, 2)$, $(6, 5)$ and $(9, 2)$. When joined they form an equilateral triangle.

The following five sets of points are also triangles.

A. $(1, 13), (6, 8)$ and $(6, 13)$.
B. $(1, 1), (3, 3)$ and $(7, 1)$.
C. $(12, 1), (17, 1)$ and $(8, 9)$.
D. $(1, 10), (5, 2)$ and $(6, 6)$.
E. $(7, 5), (15, 4)$ and $(7, 11)$.

What kinds of triangles are they?
Can you work out any of the angles at the vertices?