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Coloring the desired specific region bounded by curves drawn using insert button and text using 'gtext'?

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I am trying to color the region 'A' in the figure using MATLAB. I have drawn the fours straightlines using the insert command button in the figure window of MATLAB.
I have seen fill , shade command but seems like they work when I give the explicit equations to the straightlines/ curves.
Any way to color the region A in the figure which is bounded by the four straightliunes.parallelogram.jpg

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Accepted Answer

Image Analyst
Image Analyst on 13 Jul 2019
Try fill() or patch().

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Phenomenal One
Phenomenal One on 15 Jul 2019
Still they need the equations of the lines, but yes it would be difficult to shade a region bounded by the curves whose equations are unknown, like just in case you want to do a free hand sketch / for example purposes. So how to proceed to color a region bounded by curves whose equations we donot know?

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