You need 3,5,7,9... triangles. They have to be equilateral triangles. 1,3,5,7... need to be upside down while 2,4,6,8... have to be right side up.
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I know, bad picture, hopefully you get the point though.
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The fewest number of triangles that make up a trapezoid are two isosceles triangles.
we can make a trapezium with 3 equal triangles.
Yes, you can but it take 3 triangles.
put the triangles upside own under neathe the square the make the trapezoid the head the last triangles the ears
Two Isosceles triangles.__ ^/ / / |/ / / |V --