Shapes

Which of these are triangles? Choose all the triangles.

How many corners does a rectangle have?

Kofi turns a square tile so that it stands on one corner. His friend says, "Now it's a diamond, not a square." Is the tile still a square?

Gideon's game: is this statement true or false? "Every square is a rectangle."

Gideon's game again: "Every rectangle is a square." True or false?

A dice is a cube. How many flat faces does a cube have?

Which solid shape can roll, and can also be stacked into a tower of the same shape?

Margaret's puzzle: on a grid of 3 dots by 3 dots, how many squares can you draw with a dot at every corner? Tilted squares count too!

A hexagon like a honeycomb cell can be cut from its middle to each corner. How many triangles do you get?