問題文全文(内容文)：
Let's enjoy oriental mathematics for just a little while.
You will discover a cute world from mathematics.
Everyone in the world should love and be good at mathematics.

We are introducing the entrance exam questions for Japanese high schools.
It's an important issue for you to understand the basics of mathematics.
Would you like to solve this math problem and check out our commentary?

問題文全文(内容文)：
対角線が垂直に交わる四角形の面積の求め方

問題文全文(内容文)：
$ x=\dfrac{11}{4}$のとき,$ x^2- \left(\dfrac{13}{4}\right)^2$の値を求めよ.

東京都立墨田川高等学校過去問

問題文全文(内容文)：
AF=4㎝
正八面体の1辺の長さは？
＊図は動画内参照
2023京都府

問題文全文(内容文)：
円錐の裏技集　暗算で中心角・側面積・表面積を求める方法紹介動画です