The vertices of a triangle are (-2,3),(2,1) and (2,7). What is the area of this triangle?

Answer 1

Two vertices are on the same vertical line, namely x=2, for (2,1) and (2,7).
This is the base of the triangle with length 7-1=6.
The height of the triangle from point (-2,3) to x=2 is 2-(-2)=4.
Area of triangle
= (1/2)base*height
= (1/2)6*4
= 12