Sofie has 13 shapes. There are triangles, rectangles, and hexagons. Four shapes have 3 straight sides. Two shapes are hexagons. How many shapes are rectangles?

SAS because the base is identical and the line on the side is showing that they’re equal (the small line on the segment is used to show you they’re the same)

Now if you flip any of the triangles it will be the exact match of the other one.

And we chose SAS because the angles are in between congruent sides.

Side Angle Side