A quadrilateral has a right angle.the other angles are 2x,3x-12 and x-6
Write the an equation in terms of x
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a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on. The word "quadrilateral" is derived from the Latin words quadri, a variant of four, and latus, meaning "side". Quadrilaterals are simple (not self-intersecting) or complex (self-intersecting), also called crossed.
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