Chapter 10, Lesson 9


10-9.A distinguish between clockwise and counterclockwise
Which triangle ABC has its vertices shown in counterclockwise order?


(a) I and II only (b) I and III only (c) II and III only (d) I, II, and III

10-9.B understand degree measure in a circle
The diagram shows three circles of different radii. In each circle, a central angle intercepts an arc that is of the circumference.

Which statement about these central angles is true?
I
The angle in the circle with the greatest radius has the greatest measure.
II The angle in the circle with the least radius has the least measure.
III All three central angles have the same measure.
(a) I and II only (b) I only (c) II only (d) III only