Ineed with my math study guide for tomorrow ! !

i will provide the first picture of the study guide !
it is three pages—

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.