## Presentation on theme: "Angles. Angle are developed by 2 rays that have a usual endpoint. A B C notification ray abdominal muscle and ray BC have actually a common endpoint, allude B. Suggest B is referred to as the."— Presentation transcript:

You are watching: In angle abc point b is the

1 angle

2 angle are developed by 2 rays that have a usual endpoint. A B C notice ray abdominal and beam BC have a usual endpoint, suggest B. Suggest B is dubbed the vertex of the angle and ray BA and ray BC are dubbed the sides.

3 A B C ∠B ∠ 1 an alert that as soon as you surname an angle ∠ ABCwith three letters that the crest letter is always in the middle. ∠ CBA 1 This angle can be named in four various ways.

4 Angles space measured in units dubbed degrees. In bespeak to measure up angles, we usage a tool dubbed a protractor.

5 view this clip around how to measure up angles. Click here to view video clip

6  The Acute edge measures in between 0 and also 90 degrees.  The right angle measures exactly 90 degrees.  The Obtuse angle measures between 90 and also 180 degrees.  The right angle measures specifically 180.

7 measured in degrees Acute angleRight angleObtuse angle right angle

8  The angle addition postulate states:  For any kind of angle PQR, if A is in the inner of  ∠PQR, climate m∠PQA + m∠AQR = ∠PQR p Q A R

9  as soon as working through angles, occasionally we to compare angles.  these are nearby angles – ones the share a vertex and also a typical side but no interior points.  edge 1 and also Angle 2 are claimed to be surrounding 1 2

10 linear Pair Angles straight Pair angle are nearby angles that have actually their non-common side laying in a directly line. ∠ MNO and ∠ MNP are dubbed linear pair angles. M N O p

11 2 angles that when included together equal 90 degrees. ∠ABC and ∠CBD are complementary angles.  safety angles 2 angles that when added together equal 180 degrees. ∠WYX and also ∠ XYZ space supplementary angles.  Supplementary angles A C B D W X YZ 25 55 125

12  Congruent angles room angles of same measure. A unique pair of angles that room congruent room the upright angles.  ∠1 and also ∠3 room vertical angles and also are equal in measure.  ∠2 and ∠4 space vertical angles and are equal in measure. 1 2 3 4

13  Perpendicular lines are two intersecting straight lines that kind right angles.

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 MN ⊥ OP, thus developing four best angles. M N O p