Angle Measure - PowerPoint PPT Presentation

1 / 8
About This Presentation
Title:

Angle Measure

Description:

Angle Measure Degree A unit of measure resulting from the division of the circumference of a circle into 360 parts. Ray A part of a line that has one endpoint ... – PowerPoint PPT presentation

Number of Views:218
Avg rating:3.0/5.0
Slides: 9
Provided by: chrism278
Category:

less

Transcript and Presenter's Notes

Title: Angle Measure


1
Angle Measure
  • Degree A unit of measure resulting from the
    division of the circumference of a circle into
    360 parts.
  • Ray A part of a line that has one endpoint and
    extends infinitely in one direction. Rays are
    named by stating the endpoint first and then any
    other point on the ray. Rays are labeled using a
    one-directional arrow.

2
Angle Measure
  • Opposite Rays Two rays determined by choosing a
    point on a line. Thus, these rays share a common
    endpoint and are collinear.
  • Angle A geometric figure formed by two
    noncollinear rays that have the same endpoint.
  • Sides The rays that form the angle.
  • Vertex The common endpoint.

3
Angle Measure
  • Naming an Angle An angle is named using either
    its vertex, its vertex and a point on each ray,
    or a numerical label.
  • Labeling an Angle When labeling an angle, use
    the ? symbol in front of the angles name. When
    mentioning an angles measure, use an m in front
    of the ? to indicate measure.

4
Example 4-1d
Answer ?1, ?2, ?3, and ?RXB or ?RXN
Answer ?AXB, ?AXN, ?NXA, ?BXA
5
Angle Measure
  • Interior of an angle A point is in the interior
    of an angle if it does not lie on the angle
    itself and it lies on a segment with endpoints
    that are on the sides of the angle.
  • Exterior of an angle A point is in the exterior
    of an angle if it is neither on the angle itself
    nor in the interior of the angle.

6
Angle Measure
  • Acute angle - An angle is acute if and only if
    its measure is between 0 and 90 degrees.
  • Right angle - An angle is a right angle if and
    only if its measure equals 90 degrees.
  • Obtuse angle - An angle is obtuse if and only if
    its measure is more than 90 degrees and less than
    180 degrees.

7
Example 4-2d
Answer 150, obtuse
Answer 90, right
Answer 30, acute
8
Angle Measure
  • Congruent Angles Angles that have the same
    measure.
  • Angle Bisector A ray that divides an angle into
    two congruent angles.
Write a Comment
User Comments (0)
About PowerShow.com