How many different isosceles right triangles can be formed from three dots in the grid below? Two examples are shown.
Down below I think is the link to the triangle image
Tsk. The picture is hard to see, but I will try my best.
Isosceles triangles are triangles with 2 sides that are the same length. There are 9 dots.
There are triangles with side lengths 1, 1, sqrt(2) and 2, 2, 2*sqrt(2). So on and so forth. There are 16+4=20 triangles.
Edit: I found that this question was posted 4 MONTHS AGO! Jesus... it's like you guys are doing the same course with the same questions or something...