1.

If the area of a triangle with vertices `(-3,0),(3,0)` and `(0,0` is 9 sq. units. Then the value of `k` will beA. 3B. 6C. 9D. 12

Answer» Correct Answer - A
Let the vertices of the `Delta ABC` be
`A(-3, 0), B(3, 0)` and `C (0, k)`.
`:.` Area of `Delta ABC=1/2 |(,,),(,,),(,,)|`
Given, area is 9
`implies 9=1/2 {-3(-k)+1(3k)}`
`implies 18=3k+3k`
`implies k=18/6=3`


Discussion

No Comment Found

Related InterviewSolutions