1. 1.2 Angle Relationships and similar triangles

2. I. Geometric Properties
Vertical Angles:
have equal measures
Parallel Lines:
in the same plane but do not intersect
Transversal:
a line that intersects two parallel lines

3. Parallel lines cut by a transversal form:
Alternate Interior Angles:
equal measure
Alternate Exterior Angles:
Same Side Interior Angles:
add up to 180°
Corresponding Angles: Example 1

4. II. Triangles Angle sum of a triangle is 180° Example 2
Types of Triangles:
By Angles:
Acute Right Obtuse
By Sides:
Equilateral Isosceles Scalene

5. Similar Triangles:
exactly the same shape but not the same size
For similar triangles…
1. Corresponding angles must have the same
measure
2. Corresponding sides must be proportional
Congruent Triangles:
same shape and size
Examples 3 - 6