standard_description: Use variables to represent numbers and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set.
problem_activity: Task
Below are pictures of four quadrilaterals: a square, a rectangle, a trapezoid and a parallelogram.
[IMG]
For each quadrilateral, find and draw all lines of symmetry.


aligns: no