Page 222 - ABCTE Study Guide_Neat

A quadrilateral is any four-sided polygon.

parallelogram
• opposite sides parallel
• opposite sides congruent
• opposite angles congruent
• diagonals bisect each other

rectangle
• properties of a parallelogram
• all angles congruent and right
• diagonals congruent

rhombus
• properties of a parallelogram
• all sides congruent
• diagonals perpendicular
• bisect the angles they originate from

square
• properties of a parallelogram
• properties of a rectangle
• properties of a rhombus

trapezoid
• exactly one pair of opposite sides parallel
• consecutive angles between parallel sides are supplementary
• In an isosceles trapezoid, the nonparallel sides are congruent.
• A right trapezoid contains two right angles.

How can you use what you know about the sum of the measures of the angles in a triangle in order to find
the sum of the measures of the angles in a quadrilateral?

See if these pictures help you answer the question.