# Thread: Having some trouble with some analytical geography (High School level) (altitude)

1. ## Having some trouble with some analytical geography (High School level) (altitude)

Hi,

I am having a bit of trouble with this new module we started on analytical geometry. I am supposed to find the equation of the altitude drawn from a vertex, but nowhere in the book does it explain what altitude is. The information I am given is 3 x y coordinates on a Cartesian graph. Could anyone explain what they are looking for?

Thanks!

2. ## Re: Having some trouble with some analytical geography (High School level) (altitude)

can you prove those 3 coordinates?

3. ## Re: Having some trouble with some analytical geography (High School level) (altitude)

Originally Posted by jakncoke
can you prove those 3 coordinates?
They are A(-1,5), B(2,-3), C(7,2). I am supposed to find the equation of the altitude drawn from vertex A.

4. ## Re: Having some trouble with some analytical geography (High School level) (altitude)

I'm going to assume that they want the altitude of the triangle ABC.

An altitude of a triangle is defined to be a line through a vertex and perpendicular to a line containing the base (the opposite side of the triangle).

In this example, they are looking for the equation of the line that passes through A and is perpendicular to BC (as a line, not a line segment)