I found a problem when I was doing my homework today. This is the cycle in life.

What is a circle in life, that is, what is the circumference, area and symmetry axis of a circle in life, that is, the application of circle knowledge in life.

In our real life, there are many places where circles are needed. As long as you observe carefully, you will find it. Although I don't know how much you know about circles, today I will tell you what I know. As far as I know, the distance traveled by the wheel is the circumference of this circle. The route that the minute hand of the clock passes is the circumference of the clock face; The length of the cloth edge around the round dining table is also the circumference of the table top; The bracelet that people often wear on their hands also contains knowledge about the circumference ... it's really too much. I only said a little, and the rest will be observed by you, a master.

2

When life and math go hand in hand. What did I touch when the leaping thinking turned into words in front of me? It's not only the childlike mathematical world, but also the wonderful development of thinking accumulated bit by bit? Math diary? Rational thinking vividly expresses short but durable words —— Inscription math diary is the girl's math teacher who guides children's thinking once a week? Qiner's Secret of Line Segment was recommended by President Huang to children's periodicals. Was it written by a girl during the National Day holiday? 2010101October 6? Hello, everyone, the secret children of Wednesday Sunshine Line! I am a line segment. Do you want to know me? Let me introduce myself! I am composed of two endpoints and a straight line. There are many things in life? Dear me-you can see me on the height table, ruler and thermometer. I can get longer and shorter on the thermometer. When the child has a fever, I get longer. When the fever goes down, I get shorter. ...

three

On Thursday, July 2nd, it rained today. My mother took us to buy CDs. My mother bought two CDs for my brother. My mother gave money to my aunt 50 yuan, and my aunt got her mother 36 yuan back. 50-36=44 (RMB) We bought * * * discs and spent it on 44 yuan. On Friday, July 10, 2009, the weather was fine. Tonight, after dinner, my family went for a walk in Beida Bridge Square. My mother enrolled my brother and me to learn skating. My mother gave the teacher 100 yuan, and the teacher got her mother 38 yuan back. 100-38=62 (yuan) Our skating tuition is 62 yuan.