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Do-Now: 1) C is the midpoint of AB. Find AC, CB and AB.

Aim: How can we classify angles?. Do-Now: 1) C is the midpoint of AB. Find AC, CB and AB. 2) Z in the midpoint of XY, and XY = 27. Find XZ. HW # 6 p40/1-14, 43, 47, 55, p21/68, p25/12-15. T. B. Q. Angle ( ) is formed by two rays with the same endpoint.

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Do-Now: 1) C is the midpoint of AB. Find AC, CB and AB.

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  1. Aim: How can we classify angles? Do-Now: 1) C is the midpoint of AB. Find AC, CB and AB. 2) Z in the midpoint of XY, and XY = 27. Find XZ. HW # 6 p40/1-14, 43, 47, 55, p21/68, p25/12-15

  2. T B Q Angle ( ) is formed by two rays with the same endpoint. The rays are sides of the angles. The end point is the vertex of the angle. (The vertex is ) You could name this angle:

  3. Aim: How can we classify angles?

  4. Ex1)a) Name 1 in two other ways. C A 1 b) Name CED two other ways. 2 D E c) Would it be correct to name any of the angle E?

  5. How do we classify angles? x◦ x◦ x◦ x◦ ◦ Acute angle Right angle Obtuse angle Straight angle x = 180 x = 90 90 < x < 180 0 < x < 90

  6. Ex2) Find the measure of each angle. Classify each as acute, right, obtuse, or straight.

  7. 43° 43° If m 1 = m 2, then 1 ≅ 2 Angles with the same measure are congruent angles. 1 2

  8. What type of angle is formed ? What type of angle is formed ?

  9. Angle Addition Postulate B A O C If point B is in the interior of AOC, then m AOB + m BOC = m AOC B O C A If AOC is a straight angle, then m AOB + m BOC = 180.

  10. Ex4) What is m TSW if m RST = 50 and m RSW = 125? T W R S Ex5) If m DEG = 145, find m GEF. G F D E

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