ISEE Lower Level Math : How to find symmetry
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Example Questions
Example Question #1 : Lines
There is a four sided figure in which none of the lines run parallel to each other. Which of the following could be the appropriate term to describe the figure?
Trapezoid
Parallelogram
None of these
Rectangle
Quadrilateral
Quadrilateral
A key characteristic of a rectangle, parallelogram, and trapezoid is the fact that they each have at least one pair of lines that run parallel to each other. The only option that has lines that may not run parallel to each other is the quadrilateral, which must simply have four sides but has no specifications about parallelism.
Example Question #1 : How To Find Symmetry
If a diagonal is drawn from one corner of a rectangle to the opposite corner, what 2 shapes result?
While drawing a line across a rectangle (so that it bisects 2 sides) can result in 2 quadrilaterals, squares, or rectangles, a line drawn from one corner to the furthest corner results in two triangles. Therefore, the correct answer choice is 2 triangles.
Example Question #2 : How To Find Symmetry
How many lines of symmetry are there in a square?
A line of symmetry is a line that divides a polygon in half and each half is a mirror image of the other. In other words, you can fold the polygon over the symmetry line and each half matches up perfectly.
For a square there are four lines of symmetry. Two are from the diagonals of the square and two are from connecting the midpoints of the opposite sides.
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