DEPRECATED Trigonometric functions and side ratios in right triangles

We took this down because we now have better material for you to use instead!      


The diagram below contains parallelogram A, B, C, D and triangle triangle, E, F, G.
m, angle, B, A, C, equals, m, angle, D, C, A, equals, m, angle, E, equals, 90, degree
m, angle, C, B, A, equals, m, angle, A, D, C, equals, m, angle, F, equals, 31, degree
Which of the equalities must be true?
Please choose from one of the following options.