1 / 9

A 180 o Protractor

Inside scale from 0 o to 180 o going in an anti-clockwise direction. Outside scale from 0 o to 180 o going in a clockwise direction. A 180 o Protractor. You need to be able to measure an angle to the nearest degree. To help you do this you should always:.

ovidio
Download Presentation

A 180 o Protractor

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Inside scale from 0o to 180o going in an anti-clockwise direction. Outside scale from 0o to 180o going in a clockwise direction. A 180o Protractor

  2. You need to be able to measure an angle to the nearest degree. To help you do this you should always: 1. Look directly down onto the cross point. (this avoids parallax errors) 2. Always use the protractor in a horizontal manner as shown below. 

  3. 1 2 4 3 6 5 Estimating Angles

  4. Additional Example 2: Drawing an Angle with a Protractor Use a protractor to draw an angle that measures 80°. • Draw a ray on a sheet of paper.

  5. Additional Example 2 Continued Use a protractor to draw an angle that measures 80°. • Place the center point of the protractor on the endpoint of the ray. • Place the protractor so that the ray passes through the 0° mark.

  6. Additional Example 2 Continued Use a protractor to draw an angle that measures 80°. • Make a mark at 80° above the scale on the protractor. • Use a straightedge to draw a ray from the endpoint of the first ray through the mark you made at 80°.

  7. Check It Out: Example 2 Use a protractor to draw an angle that measures 45°. • Draw a ray on a sheet of paper.

  8. Check It Out: Example 2 Continued Use a protractor to draw an angle that measures 45°. • Place the center point of the protractor on the endpoint of the ray. • Place the protractor so that the ray passes through the 0° mark.

  9. Check It Out: Example 2 Continued Use a protractor to draw an angle that measures 45°. • Make a mark at 45° above the scale on the protractor. • Use a straightedge to draw a ray from the endpoint of the first ray through the mark you made at 45°.

More Related