i think you need to check you grammer
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To prove that two right triangles are similar, all you need to show is that one of them has one acute angle that's equal to one acute angle of the other one.
No. Similar triangles have all the same angles. An acute triangle can never have an obtuse angle, so the two cannot be similar.
All triangles need at least two acute angles
No. All triangles MUST have at least two acute angles.
Triangles can be classified by their sides or their angles. When classifying them by their angles, triangles are called: acute triangles - all three angles are acute (less than 90º) right triangles - one right angle (90º) and two acute angles obtuse triangles - one obtuse angle (larger than 90º) and two acute angles