Respuesta :

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right angle : it can’t be equilateral because all sides would have to be the same length, and it can’t be isosceles because two sides would have to be the same length
Use Pythagoras’ Theorem to figure out if it is scalene or right-angled.

20^2 = 400
10^2 = 100
17^2 = 289

400 + 100 doesn’t equal 289
100 + 289 doesn’t equal 400
400+ 289 doesn’t equal 100

So the triangle can’t have a right angle, so therefore is a SCALENE triangle.

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