Question

I would like someone to explain a diagram to me:

Answer 1

What do you want to be explained?

Answer 2

In the first line of the explanation, where it explains that the area of the triangle is equal to:\[\frac{1}{2} = (y _{1} + y_{2})(x_{1}-x_{2})\]

How or why does (y1 + y2) work? Wouldn't it be (y1-y2)? Thanks

Answer 3

@Jhane24

Answer 4

Nevermind, I got it. I thought (y1+y2) referred to the height of triangle ABC, but it refers to the sum of the bases of trapezium ABQP.

Answer 5

I also thank you, you save from reminiscing my calculus lessons.. :)