Make a triangle, each of whose sides is 2 matchsticks long. This uses six matchsticks.
Join the middle points of the sides of this triangle to one another - using another three match sticks.
You will then have four small triangles and one large one.
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Yes, if a generic square is made, and a toothpick along the vertical and horizontal line of symmetry, and then another generic square. 18 is enough to form it, and so is any double-digit number.JK they cant share any. But maybe, if you use more than toothpicks
If you get a bit creative, you will be able to make the word HAT using 5 toothpicks. If you make the 'H' skinny using 3TP and have the horizontal TP extend out towards the right. Then use 1TP to lay at an angle connecting to the second leg of the 'H' and crossing the horizontal TP leaving a bit extended to form the 'A'. The use 1TP to connect to the extended horizontal toothpick to form the 'T". 3 +1 +1 = 5 toothpicks to make the word HAT. However, if you want to do it the simple way, you'll need 8.
5
have 2 triangles put together to form a square, the medium triangle will go on top of the square, like a roof to a house....
A heptagon has 5 triangles.