Posted by Ash on Friday, January 20, 2012 at 6:12pm.
for right-angled, is 81^2 = 80^2 + 18^2 ??
for obtuse angle, 81^2 > 80^2 + 18^2
notice two sides are almost equal, so it will look like an isosceles triangle
the answer to this queston is acute! :)
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