Math-+Demos+and+Tutorials


 * ****Geometric Relationships Unit** - **Demos and Tutorials **



﻿﻿Here are some demos and tutorials that will demonstrate different skils we've learned and practiced in class.

How to Use a Protractor to Measure Angles media type="youtube" key="FeclDm7pVcI" height="390" width="640" align="center"

If you want notes on using a protractor to print out and keep for your records, ﻿ high light the steps below and then print them. 

Given angle //ABC// ,

How do we measure the size of the angle? We can measure angles using an instrument known as a **protractor**. >> == A protractor == The protractor shown below has two scales: The outer scale starts from 0˚ to180˚ going clockwise. The inner scale starts from 0˚ to 180˚ going anti-clockwise.

To measure angle //**ABC**// //,// we need to: **Step 1** **:** Place the centre of the protractor on the vertex **//B//**. **Step 2** **:** Adjust the base line so that it is aligned with the line **//BC//** ** Step 3 :** Read the value of angle //**ABC**//, from the inner scale.

If the angle is facing the other way, we could use the outer scale to measure it.

How to find the missing angle when: ﻿you are given two lines that are parallel and cut by a transversal  ﻿or   ﻿when you are given other angles of a polygon

media type="youtube" key="kqU_ymV581c" height="390" width="640"

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