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Just for fun… do these (on the back of your warm up)

Learn how to find missing angle measurements in triangles using the Triangle Angle Sum Theorem and Exterior Angle Theorem. Practice problems included.

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Just for fun… do these (on the back of your warm up)

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  1. 3 1 2 4 5 90° 40° 40° 50° 130° 90° 50° Just for fun…do these(on the back of your warm up) • Name 2 pair of alternate interior angles 5 & 3 and 4 & 1 2. What is the sum of m1 + m2 + m3? 180° • If m4 = 65° and m5 = 50°, what is m2? 65° 50° 4. Find all the angle measures 40°

  2. Just a little quickie… • Please get pg 173 off the front desk and do problems 5-20…. • We’re just getting a head start on today’s assignment… • We’ll have notes in 15 minutes… • Go

  3. 5.2Triangle Sum Theorem&Exterior Angle Theorem

  4. Objectives---What we’ll learn… • Find the measurement of a missing angle by using Triangle Angle Sum Theorem. • Find the measurement of a missing angle by using Exterior Angle Theorem.

  5. 1 3 2 Triangle Sum Theorem The sum of the angle measures in a triangle equal 180° 1 + 2 + 3 = 180°

  6. Isosceles Triangles 2 congruent sides 2 congruent base angles

  7. Isosceles Triangles & Angle Sum Theorem Base Angles are congruent. W  H E + W + H = 180o E + 2(W) = 180o

  8. exterior angle remote interior angles Exterior Angle Theorem The measure of an exterior angle in a triangle is the sum of the measures of the 2 remoteinterior angles A = C + D

  9. exterior angle remote interior angles 2 1 3 4 Exterior Angle Theorem The measure of an exterior angle in a triangle is the sum of the measures of the 2 remoteinterior angles 4 = 1 + 2

  10. Example 1 on Exterior Angle

  11. Example 2 on Exterior Angle

  12. Example 3 on Exterior Angle (more challenging)

  13. Example 4 on Exterior Angle (more challenging)

  14. Shortcut: 1. Triangle INTERIOR Angle Sum 2. Triangle EXTERIOR Angle Sum

  15. 30x find all the angle measures Do you hear the sirens????? 40x 10x2 an example with numbers find x & y 82° x = 68° y = 112° 30° x y 80°, 60°, 40°

  16. Finishtheassignment

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