If one of the nine toothpicks is the common base of the two congruent isosceles triangles with sides formed by two toothpicks.
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using four of them you make a square then using the remaining two make a criss cross in the middle of the square.
The two triangles would make either a square or a rectangle.
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.
The triangles must be congruent.
You can make three rectangles. Remember that a square can also be a rectangle.5x14x23x3