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Chapter 1: Q. 20 WE (page 21)

Without measuring, sketch each angle. Then use a protractor to check your accuracy.

45掳angle

Short Answer

Expert verified

The angle without measuring is

With protractor angel will be near about45掳.

Step by step solution

01

- Apply the protractor postulate 

AH炉in a given plane is considered.

Any point O between A and H is chosen.

ConsiderOA炉andOH炉all these rays are drawn from O on one side ofAH炉.

These rays鈥� results in pairing with the real numbers from 0 to 180 in such a way that:

The line OA炉is paired with 0, and OH炉with 180.

If OB炉is paired with x, and OC炉with y, then m鈭�BOC=|x鈭�y|.

02

– Sketch angle 90o without measuring

Thus, the figure is shown below, have 鈭�AOB=45鈭�.

03

– Superimpose the protractor to check the accuracy

By taking a protractor and put it over the 鈭�AOB. Superimpose the protractor鈥檚 OA炉line with the drawn anglesOA炉line. Measure the angle by using the protractor postulate.

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