How to get an exact measurement point to point

Hi Everyone
sorry if this has been asked but ive searched for hours.

what im trying to do is edit point to point measurements to an exact length.
i cannot for the life of me work out how to do it. please see my attached picture for what i mean.
ide like to create the A to B measurement exact.

Easel dont do that for you, not in that way.

You need to create sub-parts, which combined add to the whole. For instance a rectangle with the exact A-B height as desired. Then do the right side, and delete the upper left corner to make it into a triangle.

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thanks mate, this program is a bit of a learning curve.