geometry
This shape has 3 sides.
What is triangle?
This solid figure looks like a box, but all 6 faces are squares that are the same size.
What is a cube?
A heart, butterfly, or square may have this line that shows two equal mirror-image sides.
What is a line of symmetry?
A quadrilateral with exactly 2 pairs of parallel and same size sides.
What is a parallelogram?