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Find the length of segment ST. Round to the nearest tenth.

Put everything away and get out a piece of paper. Make sure you put your name and period on the paper. Find the length of segment ST. Round to the nearest tenth. Definition Angle : two different rays with the same endpoint. The rays are the sides of the angle. The endpoint is the vertex.

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Find the length of segment ST. Round to the nearest tenth.

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  1. Put everything away and get out a piece of paper. Make sure you put your name and period on the paper.

  2. Find the length of segment ST. Round to the nearest tenth.

  3. Definition Angle: two different rays with the same endpoint. The rays are the sides of the angle. The endpoint is the vertex.

  4. 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

  5. Protractor Postulate: The measure of angle AOB is the absolute value of the difference between the real numbers for OA and OB. A O B

  6. Classifying Angles: Angles can be classified as acute, right, obtuse, and straight.

  7. 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.

  8. 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

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

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

  11. Homework! HW: P.28: 1-21 odd

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