Download Let`s Talk Angles

Untitled.notebook
October 21, 2015
Chapter 7 ­ Angles and Parallel Lines
Complementary angles Bo
Ao
Nov 3­3:58 PM
Let's Talk Angles
Who uses angles?
Architects, designers, surveyors, carpenters, Air craft pilots, boat pilots, astronomers...etc
What is an angle?
An angle is formed when two rays meet at a common endpoint called a vertex.
Angles are measured with tools, such as a protractor, that are marked in degrees. True Bearing:
­ Describes the number of degrees, measured clockwise, between an imaginary line pointing towards true north (geographic north) and another imaginary line pointing towards an intended direction or along a path. * East is represent in land navigation and mapping at 90O angel from true north
0o
N
270o W
E 90o
S
180o
Mar 23­4:49 PM
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Untitled.notebook
October 21, 2015
Key Terms...
Nov 3­4:03 PM
Some More Key Terms...
Acute angle ­ measure is between 0o and 90 o
Right angle
­ measure is 90o; the two rays are perpendicular to each other
Obtuse angle ­ measure is between 90o and 180 o
Straight angle ­ measure is 180o
Reflex angle ­ measure is between 180o and 360 o
Nov 3­4:03 PM
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Untitled.notebook
October 21, 2015
More Key Terms...
Nov 3­4:32 PM
Geometry Set... Bring tomorrow!
Protractor
Right Triangle
Compass
Ruler
Nov 6­9:43 PM
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Untitled.notebook
October 21, 2015
EXERCISE: Identify each of the following angles using the correct terminology...
Straight
Right Obtuse
Right angle
Acute...'pretty'
Reflex
Nov 4­10:05 AM
240o
80o
45o
130o
135o
0o
Mar 30­4:24 PM
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Untitled.notebook
October 21, 2015
Nov 3­4:37 PM
7.1 ­ Measuring, Drawing and Estimating Angles
Homework
Determine the angles:
Nov 3­3:59 PM
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