Hey!
Hope this helps...
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This is actually pretty simple...
[attachment below will help too]
An obtuse triangle is where one angles is greater than 90*
A right triangle is where one angle is exactly equal to 90*
An acute triangle is where one angle is less than 90*
The BEST WAY to tell the difference between these triangles is to see/find either a 1/4 square (found on right triangles) or 1/3 circles (found on acute and obtuse triangles)...