4 sided shapes
They make four triangles, not a triangle.
The square and the parralalagram.
a big quadrilateral
25-(3x3)-8
16
There are 16 non-congruent quadrilaterals on a 3x3 geoboard.
There are 14
There are 36 unique quadrilaterals in a 3x3 square grid: 14 squares = 9 (1x1) 4 (2x2) 1 (3x3) 22 rectangles = 6 (1x2) 6 (2x1) 6 (3x3) 2 (2x3) 2 (3x2) (the total number of quadrilaterals formed by 3 x 3 pin sets will be larger, i.e. 78)
you can make 76 different triangles on a 3x3 grid
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4 sided shapes
y
They make four triangles, not a triangle.
The square and the parralalagram.
3x3