03/05/2013 - Triangles and Quadrilaterals (**)

This puzzle is rated 2 star (medium).

Description

A slight change from our "how many triangles" puzzles!

Puzzle
How many triangles and quadrilaterals are there in the above shape.

Check the solutions page for the correct answer.

01/04/2013 - How Many Triangles 4 (**)

This puzzle is rated 2 star (medium).

Description

Make sure you can clearly see the image shown above.

Puzzle
How many triangles are there in the shape shown above?

Check the solutions page for the correct answer.

12/03/2013 - How Many Triangles 3 (**)

This puzzle is rated 2 star (medium).

Description

Make sure you can clearly see the image shown above.

Puzzle
How many triangles are there in the shape shown above?

Check the solutions page for the correct answer.

19/02/2013 - How Many Triangles 2 (**)

This puzzle is rated 2 star (medium).

Description

Make sure you can clearly see the image shown above.

Puzzle
How many triangles are there in the shape shown above?

Check the solutions page for the correct answer.

15/02/2013 - Birthday Cake (**)

This puzzle is rated 2 star (medium).

Description

There is a round sponge birthday cake and eight hungry birthday guests.

Puzzle
Slice the cake with only 3 cuts, to create 8 even parts (exactly).

Check the solutions page for the correct answer.

06/02/2013 - How Many Triangles 1 (**)

This puzzle is rated 2 star (medium).

Description

Make sure you can clearly see the image shown above.

Puzzle
How many triangles are there in the shape shown above?

Check the solutions page for the correct answer.

30/01/2013 - Four in a Row (**)

This puzzle is rated 2 star (medium).

Description

For this puzzle you need to draw or visualise a 4 by 4 grid.

Puzzle
On the gird, how many squares can be shaded without having 4 shaded squares connected in a straight line (either horizontally, vertically or diagonally)?

Check the solutions page for the correct solution.

03/01/2013 - Rope Around The World (**)

This puzzle is rated 2-stars (medium).

Description

Lets image the equator of the Earth to be 40,000 kilometers long (in actual fact it is 40,075.16 kilometers!) and that the surface of the equator is perfectly flat.

I take a 40,000 kilometre piece of rope and tightly wrap it around the equator.  There are no gaps and the two ends of the rope meet perfectly.

Puzzle
However, I don't want the rope to be tightly wrapped around the equator but be lifted 1 metre above the surface of the equator all the way around.

Clearly I will need more rope... how much extra rope will I need?

Check the solutions page for the correct answer.