Answer the given questions about the indicated examples of this section. In Example 2, if 1 =
Question:
Answer the given questions about the indicated examples of this section.
In Example 2, if ∠1 = 70° and ∠5 = 45° in Fig. 2.25, what is the measure of ∠2?
Data from Example 2
Fig. 2.25, because ∠1, ∠2, and ∠3 constitute a straight angle, ∠1 + ∠2 + ∠3 = 180°
Also, by noting alternate interior angles, we see that ∠1 = ∠4 and ∠3 = ∠5.
Therefore, by substitution, we have ∠4 + ∠2 + ∠5 = 180°
Therefore, if two of the angles of a triangle are known, the third may be found by subtracting the sum of the first two from 180°.
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Related Book For
Basic Technical Mathematics
ISBN: 9780137529896
12th Edition
Authors: Allyn J. Washington, Richard Evans
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