Maths

[near mauve]

How did they get point D?

[cloud magnet]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with: ```diff
   +close

[wet valley]

I assume point D is the perpendicular from C to AB?

B/c it seems like they used the formula A=bh/2 to find the area of the triangle

[pine vigil]

I think he's asking how point D(4,2) was found.

[near mauve]

yea

[wet valley]

First, you need to find the slope/gradient of the perpendicular. You can use the fact that the slopes/gradients of perpendicular lines multiply to -1 to find the slope/gradient of the perpendicular

Now, you can find the equation of the perpendicular since you also have a point on it (namely the vertex C)