Detectives, look at this mystery envelope. There are three riddle cards inside it, waiting for you to solve them.

Riddle one: I have 3 straight sides. Riddle two: I roll anywhere and leave no footprint. Riddle three: I am the move that makes a shape face the other way.

Hands up, detectives: name us!

First job: look at the shape on the board and count its sides. Are all four sides the same? Then name the shape.

Next job: six small triangles can join to make one bigger shape. Name that bigger shape when you see it.

Last job: watch a real triangle card. It points up. After a half turn it points down. It is still the same triangle. That spin halfway round is a half turn.

A cube presses a square face and prints a square. A cylinder prints a circle. A sphere has no flat face, so it leaves no print.

Now we sort a mixed pile: flat shapes go to their name, solids go to the footprint they print.

Cards waiting: square, triangle, circle, cube, cylinder, sphere.

Spin the wheel to pick a riddle, then name the answer. Keep spinning until we have solved all four.

1. Name the shape with 4 equal sides.
2. Name the solid that prints a circle.
3. Name the move that makes a shape point the other way up.
4. Name the shape six triangles make when they join.

Which clue gave each one away?