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Chapter 1: Q19 (page 21)

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

90掳 angle

Short Answer

Expert verified

The angle without measuring is

With protractor angle will be near about 90掳.

Step by step solution

01

Step 1. Apply the protractor postulate.

AH炉in a given plane is considered.

Any point O between A and H is chosen.

Consider role="math" localid="1638347286029" OA炉鈥夆赌塧苍诲OH炉 and all these rays are drawn from O on one side of AH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

Step 2. Sketch angle 90掳 without measuring.

Thus, the figure is shown below, have 鈭�AOB=90鈭�.

03

Step 3. Superimpose the protractor to check the accuracy.

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

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