题干

已知圆的周长,求圆的面积.

一个圆形蓄水池的周长是25.12m。这个蓄水池的占地面积是多少?

上一题 下一题 0.0难度 选择题 更新时间:2015-06-30 04:55:27

答案(点此获取答案解析)

解:方法1:
25.12÷3.14÷2=4(m)
3.14×42
=3.14×16
=50.24(平方米)
方法2:

同类题2

阅读理解

    China's boss of table tennis Liu Guoliang was shocked at his first sight of Japanese teenager Miu Hirano who beat three top-ranked Chinese to claim a sensational victory of the women's singles at the Asian Table Tennis Championships.

    "She's much better than I had imagined," said Liu, on the conclusion of the continental tournament(锦标赛). "When she came out the winner of last year's World Cup, I thought maybe she took advantage of the absence of the Chinese women paddlers. However, I changed my mind when I saw her play here. She's strong enough technically and mentally, and capable of beating any one in the world," added Liu.

    Hirano, who just turned 17 years old on Friday, stunned China's world No. 1 Ding Ning 3-2 in the quarterfinals before second-ranked Zhu Yuling 3-0 and finally seeing off world No. 5 Chen Meng, also 3-0, to smash the Chinese dominance(统治)of the tournament.

    "She's so young and has so many possibilities in the future," said Liu. "That makes her success more intimidating to our women's team."

    In Liu's opinion, the difficulties that China faced in these Asian championships reflected the changes of table tennis world map in recent years.

    "It's not just recently that Japan wants to beat China," he said. "By the end of the day, their efforts finally worked out."

    The head coach, however, refused to stand all by the Japan's side. "We do need to learn from the other associations, including the Japanese, who do an excellent job on youth training," Liu said. "But one failure should not lead to the whole denial to our own team. I think it's a good thing to have competitors who can pose real challenges, which makes our sport more competitive and more healthy," he added.

根据短文内容,选择最佳答案,并将选定答案的字母标号填在题前括号内。

同类题4

完形填空

    I learned to do wood work when I was very young. I remember I made my first project—a small table when I was 9 years old. I was so1of it that I looked upon it as if I had created a(an)2. It was absolutely beautiful and it had taken me six weeks to3it. I could hardly wait to give it to Mother Winters as a(an)4. She was the head mistress of our orphanage(孤儿院), who was always kind but5with us.

    As the tables were not dry from the clear coating(清漆), our woodworking teacher told us to wait a few days before taking them to our dormitories. But I was just so6and happy that I couldn't wait. I dashed out like a7, carrying my table, smiling from ear to ear.

    When I reached the dormitory I placed the little table beside my bed. I was8it when Mother Winters entered. She walked over to the table. Running her hand9it, she noticed that it was still wet.

    “Were you 10to bring this home?” she asked.

    “No, ma'am,” I 11with my head down.

    She ordered me to throw the table out and so I did. After she left, I immediately opened the door to get it back. There was 12stuck all over. I brushed and cried, but the dirt would not come off.

    I hid the table in my closet and never 13it. However, a year later during a cleaning-up, it was discovered. Painfully, I had to give the table to Mother Henderson, my houseparent, thinking that she would 14it away.

    Thirty years later at a reunion, I15that Mother Henderson was living nearby, so I drove up to see her. We talked cheerfully for a long time. As I was about to leave, she asked me to come down to her 16to get something important. I followed her 17into a dark corner. She picked something up.18she turned around, I could see that she was holding a little table. Mother Henderson kept the little table that I had given up for lost so long ago.

    Today, I look at that table with bittersweet memories but full of 19to Mother Henderson, who kept the table for a young orphan who20it so much.