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Similar to the ruler postulate, if point B is in the interior of AOC, then mCOB+mBOA=mCOA
(<AOC)
Postulate 1-8: Angle Addition Postulate
Vertical angles are opposite congruent angles created by the intersection of two lines
<1 and <3 are vertical angles <2 and <4 are
vertical angles
Adjacent angles are angles that share a common side, common vertex, and no common interior points.
<KIH and <KIJ are adjacent angles
Complementary angles are two angles who’s measures sum to 90.
<TSU and <USV are
complementary angles.
If m<TSU=42, what is m<USV?
<TSU is the complement of
<USV
Supplementary angles are two angles who’s measures sum to 180.
<TSU and <USV are supplementary angles. <TSU is the supplement of<USV. If m<TSU=120, what is m<USV?
Use the adjacent angles below to solve the following:
m<HOK = 4x-6, m <KOB=6x+2, find x andm<HOK.
Ex. 1
Line up the bottom of the protractor with a side of the angle and center of angle with center of protractor. Extend the line of the other side and read the degree.
How do we measure angles?