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Measurement of Segments and Angles - Lesson 1-2

Hello again...today, we all got our "tools of geometry!"  That would be that thing I gave you that has a straight edge (for measuring segments), a protractor (for measuring angles), and a compass (for constructing circles and arcs of circles).  We then practiced using the various parts of this tool to measure segments and angles.  You should remember the following, paying particular attention to the symbology!

 

The measure of an angle

 

We then discussed how we classify angles by their measure:

An Acute Angle


A Right Angle


An Obtuse Angle


A Straight Angle

 

At this point, we moved on to some new material...something you didn't do in 4th grade!  It had to do with how we measure angles to a degree of accuracy better than degrees:

Parts of a Degree

 

We also discussed how to convert from fractional degrees to degrees, minutes, and seconds form and vice versa.  Make sure you can do these types of problems for the quiz and test!!

Fractional degrees to degrees / minutes / seconds

 

Degrees / Minutes / Seconds to fractional degrees

 

We also learned how to add and subtract angle measures in degrees, minutes, and seconds form.  Here’s an example:

Subtracting angles in D/M/S form

 

We ended by learning the definitions for congruent segments and congruent angles and learning what symbols to use in association with them:

Congruent Segments


Congruent Angles

Other Links
Class Notes
Lesson 1-1
Lesson 1-2
Lesson 1-3
Lesson 1-4
Lesson 1-5
Lesson 1-6
Lesson 1-7
Lesson 1-8
Lesson 1-9
Test Topics
 
   
 
   
If you have questions, email me at baroodyj@doversherborn.org