How do I determine both width and angles to cut on my deck

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Picture of deck

I am trying to figure out how to calculate the length of the board and both cut #1 and #2 angles.

The board will go from bottom left side of deck to top right side. The far right line is my house. Nothing should be attached to there.

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I think this picture answers the problem: enter image description here

The angles are approximately 21 degrees and 69 degrees. Assuming you are placing a sequence of 2x4's along the deck, I have given a formula for the length of short side of the n'th 2x4