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SECTION 4.2 - Measuring Angles in Triangles

SECTION 4.2 - Measuring Angles in Triangles. November 12, 2009. Triangle Angle Sum Theorem. The three interior angles of a triangle have a sum of 180. Ex.1. 42. x. 70. Ex.2. 3x. 2x+11. x+7. Exterior Angle Theorem.

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SECTION 4.2 - Measuring Angles in Triangles

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  1. SECTION 4.2 - Measuring Angles in Triangles November 12, 2009

  2. Triangle Angle Sum Theorem The three interior angles of a triangle have a sum of 180 . Ex.1 42 x 70

  3. Ex.2 3x 2x+11 x+7

  4. Exterior Angle Theorem The exterior angle of a triangle is equal to the sum of the 2 remote interior angles. Remote Interior <s Exterior < Linear Pair The exterior angle is formed by extending a side of a triangle.

  5. Exterior Angle Theorem Examples 40 Ex. 3 x 110 Ex. 4 9x-13 4x+5 2x+3

  6. Right Triangle Corollary In a right triangle, the 2 acute angles are complementary. Ex. 5 42 x

  7. Ex. 6 2x+17 3x+8

  8. 4.1& 4.2 Quiz Review 3 name the triangles by side and angle 7 name the parts of an isosceles triangle 3 Theorems and Corollary fill in the blank 4 Triangle figures - Find equation and "x" PW 4-2: #6, #11, #7 SG 4-2: #3

  9. Study Guide worksheet 4.2

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