Welcome to Interactive Chalkboard Glencoe Geometry Interactive Chalkboard Copyright © by The McGraw-Hill Companies, Inc. Developed by FSCreations, Inc., Cincinnati, Ohio Send all inquiries to: GLENCOE DIVISION Glencoe/McGraw-Hill 8787 Orion Place Columbus, Ohio 43240

Splash Screen

Transparency 3 Click the mouse button or press the Space Bar to display the answers.

Transparency 3a

Contents Lesson 3-1Parallel Lines and Transversals Lesson 3-2Angles and Parallel Lines Lesson 3-3Slopes of Lines Lesson 3-4Equations of Lines Lesson 3-5Proving Lines Parallel Lesson 3-6Perpendiculars and Distance

Lesson 2 Contents Example 2Use an Auxiliary Line Example 3Find Values of Variables OBJECTIVE: To use algebra to find angle measurements (2.9.8E) (M8.C.1.1.3)

Example 2-2a Grid-In Test Item What is the measure of  RTV? Read the Test Item Be sure to identify it correctly on the figure.

Example 2-2b Solve the Test Item Alternate Interior Angles Theorem Definition of congruent angles Substitution

Example 2-2c Angle Addition Postulate Write each digit of 125 in a column of the grid. Then shade in the corresponding bubble in each column. Definition of congruent angles Substitution Alternate Interior Angles Theorem

Example 2-2c Answer:

Example 2-2d Grid-In Test Item What is the measure of  IGE? Answer:

Example 2-3e If ALGEBRAand find x and y. Find x. by the Corresponding Angles Postulate.

Example 2-3f Definition of congruent angles Substitution Subtract x from each side and add 10 to each side. Definition of congruent angles Substitution Find y. by the Alternate Exterior Angles Theorem.

Example 2-3g Simplify. Add 100 to each side. Divide each side by 4. Answer:

Example 2-3h Answer: ALGEBRA If and find x and y.

REVIEW: Find the measurement of angle 1. Draw a parallel line (between the other 2 lines through angle 1 vertex and use Alternate Interior angles) Answer: 67 ° 36° 31 ° 1

End of Lesson 2

End of Custom Show End of Custom Shows WARNING! Do Not Remove This slide is intentionally blank and is set to auto-advance to end custom shows and return to the main presentation.

End of Slide Show