Question: what are all the triangle shapes?
Answer: Equilateral triangle. The Equilateral triangle shown on the left has three congruent sides and three congruent angles. ... 
Isosceles triangle. The Isosceles triangle shown on the left has two equal sides and two equal angles.
Scalene Triangle. The Scalene Triangle has no congruent sides. ... 
Acute Triangle. ... 
Obtuse Triangle.