Mary says the pen for her horse is an acute right angle . is this possible

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Which expression converts 45 degree to radians