Question

Triangle JKL, with vertices J(2,3), K(7,4), and L(3,9), is drawn inside a rectangle, as

shown below.

What is the area, in square units, of triangle JKL?

Answer 1

14.5

Explanation:

The area of the rectangle is
`(5)(6)=30`.

The areas of the three right triangles in the rectangle but not in
`\triangle JKL` are 2.5, 10, and 3.

`\implies [JKL]=30-2.5-10-3=14.5`