you see if it equals to 360 degrees or 180 degrees then you add the sides that they have gave you and see if it is correct.
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the angles of a quadrilateral will add up to 360 degrees, so if you have the angles of the first three vertices, you can find the measure of the last one by subtracting the sum of all the other angles from 360.
true
The way to find the missing side of a triangle-THIS ONLY WORKS ON RIGHT ANGLED TRIANGLES-is square both sides seperately and then add them together to give you the square of the missing side-find the square root and that is the size of the missing side-eg. if you have a RIGHT ANGLED TRIANGLE with sides of 3inch and 4inch then (3x3) + (4x4) = 25 so the square root of 25 is 5 meaning the missing side is 5inch.
Unless it is a rhombus (or square) you cannot.
The area of the quadrilateral.