Answer:
1. No. A right triangle has an exact angle of 90°. If any angle becomes 90 degrees or more, it is not an acute triangle.
2. An equilateral triangle is always acute, since all angles (which are 60) are all less than 90. All acute triangle angles are less than 90 degrees.
3. In an equilateral triangle, all three sides are the same length while an isosceles triangle, only two sides are the same length.
4. Congruent triangles have the same shape and size, while Similar triangles have the same shape but sizes can vary.
Step-by-step explanation:
