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EXAMPLE 1

Name the three angles in the diagram. WXY, or YXW. YXZ, or ZXY. WXZ, or ZXW. You should not name any of these angles X because all three angles have X as their vertex. EXAMPLE 1. Name angles.

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EXAMPLE 1

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  1. Name the three angles in the diagram. WXY, or YXW YXZ, or ZXY WXZ, or ZXW You should not name any of these angles X because all three angles have Xas their vertex. EXAMPLE 1 Name angles

  2. Use the diagram to find the measure of the indicated angle. Then classify the angle. a.KHJ b. GHK c. GHJ d. GHL EXAMPLE 2 Measure and classify angles SOLUTION A protractor has an inner and an outer scale. When you measure an angle, check to see which scale to use.

  3. o a.HJ is lined up with the 0 on the inner scale of the protractor. HKpasses through 55 on the inner scale. So, mKHJ = 55 . It is an acute angle. o o o b.HG is lined up with the 0 on the outer scale and HKpasses through 125 on the outer scale. So,mGHK = 125 . It is an obtuse angle. o o o c.m GHJ = 180. It is a straight angle. o d.m GHL= 90. It is a right angle. EXAMPLE 2 Measure and classify angles

  4. ANSWER PQR , PQS, RQS . PQS is a right angle . for Examples 1and 2 GUIDED PRACTICE 1. Name all the angles in the diagram at the right.Which angle is a right angle?

  5. Straight Angle ANSWER for Examples 1and 2 GUIDED PRACTICE 2. Draw a pair of opposite rays. What type of angle do the rays form?

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