Non-congruent represents something that is not in agreement, If superimposed it does not coincide. If two figures don't have the same shape they are considered non-congruent in Geometry. In order to be considered congruent, a figure must be the mirror image of another, if it is not, the figure is non-congruent.
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There are 16 non-congruent quadrilaterals on a 3x3 geoboard.
a triangle. . .
There are 6 of them.
An isosceles trapezoid
An isosceles trapezoid