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All triangles need at least two acute angles
No. All triangles MUST have at least two acute angles.
Yes
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
No. The two sides that are acute can form and angle that could be larger than or equal to 90 degrees.