53/100 ÷ 5 can be reduced down to
7
-----
20
Good Luck! :)
Check the picture below.
and since a triangle has a sum of 180° for all interior angles.
A = 180 - 39.34 - 25
A = 115.66

make sure your calculator is in Degree mode.
The irrational number that can be added to pi to get a rational sum is PI.
The answer is a because it starts at 0 then goes up to 23 and then it goes up to 46.