Yes.
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They are both equal to 90 degrees
The answer is 25/110 or 1/4.
No.
yes 2/4 is because it is equivalent to 1/2 which is a benchmark fraction.
A benchmark is an easy to work with number. you round fractions to the nearest benchmark and it will be very easy to add. i use 1/4, 1/2, 3/4, 1, 1 1/4, 1 1/2, 1 3/4, 2, 2 1/4, and so on as benchmarks.