Reasoning with shapes

Justin says this is a 2D shape. Amanda says this is a 3D shape. Who is correct?

• Neither because it is a square.

• Justin because a square lies flat.

• Amanda because it has 4 sides.

Megan says a cube and a rectangular prism are the same shape. Is she correct?

• No, because all the sides of a cube are equal and not all the sides of a rectangular prism are equal.

• Yes, because they both have six faces.

• No, because one is 2D and the other is 3D.

Justin asked Mark where he might find a hexagon in real life. Mark said a stop sign. Is Mark correct?

• Yes, Mark does not lie.

• Yes, stop signs are hexagons.

• No, a hexagon has 6 sides and a stop sign has 8 sides.

Sally and Sue are playing soccer at recess. Sally says the soccer ball is a sphere. Sue says the soccer ball is a circle. Who is correct? Why?

Sarah says that every shape with 4 sides is a square. Is she correct? Why or why not?