 Put the work and answer for #40 from the homework last night. If you didn’t do it, or don’t know that answer, write “didn’t do it” in that space.

 Segment MN  Point R  Line ST  Ray AB  Ray BA

 A figure formed by two rays that have the same endpoint.  The two rays are called the sides of the angle  The common endpoint is called the vertex.  Can be named as B, ABC or 1  I prefer ABC or 1  Make sure that the vertex is the middle point. A B C 1

 Acute Angle – an angle measuring between 0 and 90 degrees  Right Angle – an angle measuring 90 degrees  Obtuse Angle – an angle measuring between 90 to 180 degrees  Straight Angle – an angle measuring 180 degrees

 If point B lies in the interior of AOC, then m AOB + m BOC =m AOC If AOC is a straight angle and B is any point not on line AC, then m AOB + m BOC =180 B C OA O A C B

 The measure of  AOB is x and the measure of  BOC is x+3. The measure of  AOC=55 °. What is m  AOB and m  BOC? C B A O

 Angles that have equal measures  If m R=40 ° and S is congruent then m S=40 ° m R=m S THEN

 2 angles in a plane that have a common vertex and a common side but no common interior points.NOT ADJACENT ADJACENT

 A ray that divides the angle into 2 congruent adjacent angles. X W Z Y 30 °

 Supplementary angles are 2 angles that add up to 180°  Example: <A and <B are supplementary. <A=2x+5 and <B=3x-10. What is X?  Complementary angles are 2 angles that add up to 90°  Example: <R and <S are complementary. <R is twice as big as <S. What is <R?

 Angles that share a vertex and whose sides are opposite rays of each other.  They are “across” from each other when lines intersect. A B C E O D

 Vertical Angles are congruent to each other  **We will do the proof to this theorem in the next chapter**

 Complete the worksheet with a partner

 Test on Tuesday on Unit 1  Pick 20 of the suggested problems from the study guide and create your own homework assignment!