Rectangles have four right angles
thus ∡ R + ∡S = 90° + 90°
= 180°
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That's the same thing as saying 2/3 multiplied by 7/6.
So, the answer is 7/9.
CD, CE, HG, GF, AL, LB, AB, HF, DE. A line segment is comprised of any two points. The ones I listed are the ones specifically named in the picture.
