Move two toothpicks and make four complete squares. No pieces of squares may be left over. (Use 16 toothpicks to set up the original shape.)
Set 02
Rolling Penny
If a penny is rolled around a second penny as shown, will the rolling penny have Lincoln right side up or upside down when it gets to the bottom?
Triangle of Pennies
Arrange 10 pennies as shown. Now move just 3 pennies to turn the triangle upside down. Draw a good diagram to show how you did it.
Gardens, Congruent
Here is a space for a garden that wraps around the corner of an apartment building. The garden space will be shared by four families. You are the building superintendent. Your job is to make a fair division of the space by dividing it into four plots that are exactly the same shape and same size. Can you do it?
Covered Shapes
The circle below partly covers figures of the types numbered (1) through (6). Determine for each exposed segment (A) through (H) which numbered figure(s) it could be a part of.