Today's PUZZLE CLASSIC OF THE DAY
PREVIOUS 12 DAYS
20 Dots: How Many Squares?
How many different squares are indicated by 4 dots that mark their corners?
10 Dots: Equilateral Triangles
How many different equilateral triangles are indicated by 3 dots that mark their corners?
12 Dots: Counting Squares
How many different squares are indicated by 4 dots marking their corners?
Triangles in the Star of David
How many triangles can be spotted in this shape?
Squares in a Grid: How Many?
How many squares are in the grid? Click a square => "Count" button.
Triangles in Pentagon: How Many?
A 5-pointed star is inscribed into a regular pentagon. How many triangles can you find in it? Select a triangle and click "Count" button.
Removing Openings
This wooden slab, 8'x12', has 3 square holes in it. Cut it into two identical pieces which, when rearranged, would create a slab 9'x10' without any holes in it.
Stellar Orbits
Place digits 1-6 in the six intersections so that the digits on each orbit would add up to 14.
Right Triangles in the Square
How many right triangles are in this square?
L-Shape to Square Frame
Cut this shape into two pieces which, when rearranged, can produce a perfect square frame.
Diamond: Counting Triangles
How many triangles can you count in this diamond?
Drawing Balls
A bag contains either a red ball or a blue ball. A red ball is then dropped into the bag, so now it has 2 balls. A drawing is held, and a red ball is drawn out of the bag. What’s the probability of the remaining ball also being red?