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Big Ideas Math Integrated I, 2016 View details

2. Inductive and Deductive Reasoning

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Exercise 50 Page 458

What tool do you use to measure an angle?

Protractor Postulate

Practice makes perfect

Examining the statement, we see that we want the measure of ∠ DAC. To determine the measure of an angle we need a protractor, which means the postulate we use must be the Protractor Postulate.

Protractor Postulate
The measure of ∠ AOB, which can be written as m∠ AOB, is equal to the absolute value of the difference between the real numbers matched with OA and OB on a protractor.

We can visualize this postulate using the given figure and a protractor.