2.2 Definitions and Biconditional Statements. Objectives/Assignment. Recognize and use definitions. Recognize and use biconditional statements. Assignment: 2-42 even, 60-68 even. Definitions. Perpendicular Lines are those which intersect and form a right angle
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“is perpendicular to”
Points D, X, and B are collinear.
TRUE Two points are collinear if they lie on the same line.
AC is perpendicular to DB.
TRUE The right angle symbol in the diagram indicates that lines AC and DB intersect to form a right angle; so the lines are perpendicular.
AXB is adjacent to CXD.
FALSE By definition, adjacent angles must share a common side. They do not, so are not adjacent.