CK-12 Geometry-Concepts

http://www.ck12.org Chapter 4. Triangles and Congruence

11.Given: Isosceles 4 ICSwith^6 Cand^6 SIOis the perpendicular bisector ofCSProve:IOis the angle bisector

of^6 CIS

On thex−yplane, plot the coordinates and determine if the given three points make a scalene or isosceles triangle.

12. (-2, 1), (1, -2), (-5, -2)


13. (-2, 5), (2, 4), (0, -1)


14. (6, 9), (12, 3), (3, -6)


15. (-10, -5), (-8, 5), (2, 3)


16. (-1, 2), (7, 2), (3, 9)