Solve the Problem $\sin \theta = 0.9$ , Find $\sin ( \theta + \pi )$

Multiple Choice

Solve the problem.
-If $\sin \theta = 0.9$ , find $\sin ( \theta + \pi )$ .

A) $0.1$
B) $- 0.1$
C) $0.9$
D) $- 0.9$