Convex polygons

You have an unlimited number of cardboard squares and unilateral triangles, each with unit sides as shown on the left. The triangle has three sides, the square four.

Use these pieces to built convex polygons with 5 to 12 sides. The polygons with 5 and 6 sides are shown below. Now built

Now built polygons with 7, 8, 9, 10, 11 and 12 sides.

Have Fun!

Problem from:
Gardner, Martin. 1973. Mathematical Games. Scientific American, volume 228, no. 5, p. 102. 
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