Use the diagram below to answer the questions. EF is the midsegment of trapezoid ABCD. Posting for the 5th time will give brainliest for full answer

Which one ? is the answer and how to find this answer

What is the gcf of 20c^3-5c^4+30c^6

The statements below can be used to prove that the triangles are similar. ? △abc ~ △xyz by the sss similarity theorem. which mathematical statement is missing? ∠b ≅ ∠y ∠b ≅ ∠z