• a) \(A H C K\) là hình bình hành.
• b) \(I\) là trung điểm \(H K \textrm{ }\textrm{ } \Longrightarrow \textrm{ }\textrm{ } I B = I D\).

• a) Tứ giác \(E B F D\) là hình bình hành.
• b) Ba điểm \(E , O , F\) thẳng hàng.

a) Hai tứ giác \(A E F D\) và \(A B F C\) là hình bình hành.
b) Các trung điểm của ba đoạn \(A F , D E , B C\) trùng nhau.

• △OAM=△OCN (cùng diện tích).
• Tứ giác \(M B N D\) là hình bình hành.

• a) Hai tứ giác \(A E F D\) và \(A E C F\) là hình bình hành.
• b) \(E F = A D\), \(A F = E C\).

Sure! Here's a passage answering all those questions in a natural and organized way:

My favorite hobby is reading books. I started reading seriously when I was about ten years old, and since then, it has become a big part of my life. Most of the time, I read by myself because I enjoy the quiet and focus it brings, but sometimes I also join online book clubs to discuss what I’ve read with others.

I usually read at home, especially in the evenings when the day is winding down. On weekends, I like to go to a nearby park and read under a tree if the weather is nice.

I think reading is a great hobby because it helps me relax and learn new things at the same time. It also improves my vocabulary and imagination. I can travel to different worlds and experience different lives—all through the pages of a book.

Would you like a version written at a simpler or more advanced English level?