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Simply with a protractor and the 4 interior angles must add up to 360 degrees
Use a protractor and you'll find base angles are equal and that the 4 interior angles add up to 360 degrees
Use a protractor and the 4 interior angles should add up to 360 degrees.
With a protractor and the 4 interior angles of any 4 sided quadrilateral always add up to 360 degrees
The 4 interior angles of any 4 sided quadrilateral add up to 360 degrees and using a protractor will prove it.