how to fill or find height

Hi i have the following image in which a bigger rectangle encapsulates the smaller one. I need to do either of the following 1- find height h1 and h2 . or 2- fill the inner triangle with any color

Thank you

[KSSV]

YOu have the coordinates in hand or you want those from the image?

Answer 1

[uzmeed]

i need it for the image. i am unaware of coordinates