Question

3. Classify each triangle by its angles and its sides

Answer 1

11. isosceles triangle (two same lengths and angles) 12. equilateral triangle (all same side lengths and angles)

Answer 2

11. Isosceles triangle.
Can be identified when two sides are equal and adjacent base angles are equal.

12. Equilateral triangle.
Can be identified when all sides are equal and all interior angles = 60 degrees.