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Is there a key shortcut for making sure the sides are perfectly horizontal and vertical? I do not want the rect. to have slanted sides. Please see attached. Trying to superimpose a rectangle on Mona Lisa portrait.
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GeoGebra is not a drawing software. Every object has an equation, and vice versa.
So, in order to build a rectangle you must use either correct points coordinates in the Graphing View, or build it using the geometry tools, like Parallel line and Perpendicular line.
You can find the interactive tutorials for all the apps here https://www.geogebra.org/a/14
you can study the attached, overall properties of quadrilateral: colour, opacity, style and filling
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