Quadrilateral Investigation
Measure sides, slopes and angles to investigate properties.
Remember
Parallel lines have the same slopes.
Perpendicular lines have opposite reciprocal slopes (a/b and -b/a)
Perpendicular lines form right angles.
Measure angles and line segments
![Image](https://stage.geogebra.org/resource/XqeDEQeK/Qaa0I0EwfY8Tw0ut/material-XqeDEQeK.png)
![Image](https://stage.geogebra.org/resource/ZCnuBbck/rNTJY1lP4oVgBRG5/material-ZCnuBbck.png)