8.1 Quadrilaterals

 Quadrilateral – closed geometric figure with four sides and four vertices.  Segments of a quadrilateral intersect only at their endpoints.

 Quadrilaterals are named using their vertices in order.

 Any two sides, vertices, or angles are either consecutive or nonconsecutive.  Segments that join nonconsecutive vertices or a quadrilateral are called diagonals.

 Refer to quadrilateral DEFG.  A. Name all pairs of consecutive angles  B. Name all pairs of nonconsecutive vertices.  C. Name all pairs of consecutive sides.

 Find the measure of angle M.

 The sum of the measures of the angles of a quadrilateral is 360 degrees.  Ex. 2: Find the missing measure.

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