**The area of a triangle with vertices (-3,0),(3,0) and (0,k) is 9 sq. units. The value of k will be (a) 9 (b) 3 (c) -9 (d) 6**

###### Answers:

(b) We know that, area of a triangle with vertices (x_{1},y_{1}),(x_{2},y_{2}) and (x_{3},y_{3}) is given by