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Angle Relationships. Perpendicular Lines. Special intersecting lines that form right angles. Adjacent Angles. Angles in the same plane that have a common vertex and common side, but no common interior points. Vertical Angles. Two non-adjacent angles formed by two intersecting lines.
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Angle Relationships Perpendicular Lines Special intersecting lines that form right angles Adjacent Angles Angles in the same plane that have a common vertex and common side, but no common interior points Vertical Angles Two non-adjacent angles formed by two intersecting lines
Angle Relationships Perpendicular Lines Special intersecting lines that form right angles Adjacent Angles Angles in the same plane that have a common vertex and common side, but no common interior points
Angle Relationships Perpendicular Lines Special intersecting lines that form right angles Adjacent Angles Angles in the same plane that have a common vertex and common side, but no common interior points Vertical Angles Two non-adjacent angles formed by two intersecting lines
1 3 4 2 Vertical Angles
Angle Relationships Linear Pair Adjacent angles whose non-common sides are opposite rays
Angle Relationships Linear Pair Adjacent angles whose non-common sides are opposite rays Supplementary Angles Two angles whose measures have a sum of 180 degrees
1 2 Supplementary Angles
Angle Relationships Linear Pair Adjacent angles whose non-common sides are opposite rays Supplementary Angles Two angles whose measures have a sum of 180 degrees Complementary Angles Two angles whose measures have a sum of 90 degrees
Angle Relationships Notes Vertical angles are congruent The sum of the measures of the angles in a linear pair is 180 Means perpendicular M N Means M is perpendicular to N
Angle Relationships Notes If a line is perpendicular to a plane, then that line is perpendicular to every line in the plane that it intersects
N M O Q P L From this picture, you CAN assume L, P, and Q are collinear All points shown are coplanar Rays PM, PN, PO, and LQ intersect at P P is between L and Q N is in the interior of angle MPO Angle LPQ is a straight angle
N M O Q P L From this picture, you CANNOT assume Angle QPO is congruent to angle LPM Angle OPN is congruent to angle LPM Ray PN is perpendicular to ray PM Ray LP is congruent to ray PQ Ray PQ is congruent to ray PO Angle QPO is congruent to angle OPN
Angle Relationships Checking for Understanding J G I H K From the picture, find the value of x Angle GIJ = 9x –4 and angle JIH = 4x -11
Angle Relationships Checking for Understanding 3 2 4 1 5 Angle 1 and angle 4 Angle 1 and angle 2 Angle 3 and angle 4 Angle 1 and angle 5