All triangles have 3 interior angles that add up to 180 degrees and they are:-
Right angle triangle: 90 degree angle and 2 acute angles
Obtuse triangle: An obtuse angle and 2 acute angles
Scalene triangle: 3 acute angles of different sizes
Isosceles triangle: 2 equal angles and another angle
Equilateral triangle: 3 equal angles that each measures 60 degrees
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All right-angles triangles. That is triangles that contain one angle at 90 degrees.
To prove that two or more triangles are similar, you must know either SSS, SAS, AAA or ASA. That is, Side-Side-Side, Side-Angle-Side, Angle-Angle-Angle or Angle-Side-Angle. If the sides are proportionate and the angles are equal in any of these four patterns, then the triangles are similar.
side- angle- side
SSS- side side side SAS- side angle side ASA- angle side angle There is also: AAS- angle angle side For right triangles: HL- hypotenuse leg
No because 30-60-90 triangles are right angle triangles