Question

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Answer 1

@welshfella

Answer 2

please explain???

Answer 3

just do base*height

Answer 4

Do you know the angle of how much the rotated rectangle is?

Answer 5

nope

Answer 6

Hm..
Because, if you knew it, you can use a formula. Here is an example:
The rectangle is rotated 50 degrees, so you use this: x' = x cos(-50o) - y sin(-50o)
y' = y cos(-50o) + x sin(-50o)

Answer 7

this is geometry