1. Warm Up
Solve for x.
x x + 1 = 90
4x + 2 = 90
4x = 88
x = 22

2. Questions over HW?

3. Skills Check

4. Parallel Lines, Transversals, & Base Angles

5. Parallel Lines & Transversals

6. Alternate Interior Angles
Opposite sides of the transversal & inside the parallels
Are congruent
Equation:
angle = angle

7. Consecutive Interior Angles
Same side of the transversal & inside the parallels
Are supplementary
Equation:
angle + angle = 180

8. Alternate Exterior Angles
Opposite sides of the transversal & outside the parallels
Are congruent
Equation:
angle = angle

9. Corresponding Angles
Same location but at different intersections (only travel on the transversal)
Are congruent
Equation:
angle = angle

10. Which path?
Same path:
Angles are congruent. 11 10 13 12 15 14 17 16

11. Angles are supplementary.
Which path?
Same path:
Angles are congruent. 11 10 13 12 15 14 17
Not on the same path:
Angles are supplementary. 16

12. Isosceles Triangles

13. Base Angles
If 2 angles in a triangle are congruent, then the sides opposite them are congruent.

14. Solve for x.
2x + 25 = 7
2x = -18 12
x = -9

15. Base Angles
If 2 sides in a triangle are congruent, then the angles opposite them are congruent.

16. Solve for x.
6x + 1 = 55
6x = 54 3
x = 9

17. Practice WS