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Might it help to draw the triangle out on isometric paper?
What is the size of the angles created by the small triangles on the paper?
When you're working out the angles in the triangles, look carefully at how the sides cut through the grid triangles.
Cartesian Isometric
Age 7 to 11
Challenge Level 
Might it help to draw the triangle out on isometric paper?
What is the size of the angles created by the small triangles on the paper?
When you're working out the angles in the triangles, look carefully at how the sides cut through the grid triangles.
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