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Contents Lesson 1-1Points, Lines, and Planes Lesson 1-2Linear Measure and Precision Lesson 1-3Distance and Midpoints Lesson 1-4Angle Measure Lesson 1-5Angle Relationships Lesson 1-6Polygons

Lesson 4 Contents Example 1Angles and Their Parts Example 2Measure and Classify Angles Example 3Use Algebra to Find Angle Measures

Example 4-3a INTERIOR DESIGN Wall stickers of standard shapes are often used to provide a stimulating environment for a young child’s room. A five-pointed star sticker is shown with vertices labeled. Find m  GBH and m  HCI if  GBH  HCI, m  GBH 2x + 5, and m  HCI 3x – 10.

Example 4-3b Given Definition of congruent angles Substitution Add 10 to each side. Subtract 2x from each side.

Example 4-3c Given Simplify. Use the value of x to find the measure of one angle. Since. or 35 Answer: Both measure 35.

Example 4-3d SIGNS A railroad crossing sign forms congruent angles. In the figure,  WVX  ZVY. If m  WVX 7a + 13 and m  ZVY 10a – 20, find the actual measurements of  WVX and  ZVY. Answer:

End of Lesson 4

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