The radian is the standard unit of angular measure, used in many areas of mathematics. The length of an arc of a unit circle is numerically equal to the measurement in radians of the angle that it s; one radian is just under 57.3 degrees (expansion at ). The unit was formerly an SI supplementary unit, but this category was abolished in 1995 and the radian is now considered an SI derived unit. 

Separately, the SI unit of solid angle measurement is the steradian. 

The radian is represented by the symbol rad. An alternative symbol is , the superscript letter c (for "circular measure"), the letter r, or a superscript , but these symbols are infrequently used as it can be easily mistaken for a degree symbol (°) or a radius (r). So, for example, a value of 1.2 radians could be written as 1.2 rad, 1.2 r, 1.2, or 1.2, or 1.2. 

Radian describes the plane angle subtended by a circular arc as the length of the arc divided by the radius of the arc. One radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. More generally, the magnitude in radians of such a subtended angle is equal to the ratio of the arc length to the radius of the circle; that is, , where "θ" is the subtended angle in radians, "s" is arc length, and "r" is radius. Conversely, the length of the enclosed arc is equal to the radius multiplied by the magnitude of the angle in radians; that is, . What are the answers to this following set of questions: 1. What symbol represents the radian?
2. Are there any others?
3. Are they frequently used?
4. Why?
5. What does the term describe?
6. Is it used in many areas?
7. What is equal to the measurement in radians?
8. What was the units former classification?
9. Does that category still exist?
10. What happened to it?
11. When?
12. What is the category it is in now?
13. What is a steradian?
Answer: 1. rad.
2. yes
3. no
4. but these symbols are infrequently used as it can be easily mistaken for a degree symbol (°) or a radius (r
5. the plane angle subtended by a circular arc
6. yes
7. The length of an arc of a unit circle
8. an SI supplementary unit
9. no
10. it was abolished
11. 1995
12. an SI derived unit.
13. the SI unit of solid angle measurement

(CNN)Buddy Elias spent much of his life preserving the memory of his cousin Anne Frank. His death Monday brought back memories for me. 

We met three years ago in an Atlanta hotel conference room. He and his wife, Gerti, were touring the United States to promote a new book. 

I could tell instantly that he was related to Anne. His face resembled hers so much that it felt almost as though I was meeting her in person. 

"Anne Frank's Family" had just been published, based on 14 boxes of letters, postcards, photos and documents that Gerti accidentally discovered in the attic of their house in Basel. 

Elias told me that it wasn't just Anne who loved to write; everyone in the family did. 

The 6,000 recovered documents told a story of a family torn apart by war and anti-Semitism. That day in Atlanta, I listened to Elias tell me about loved ones he lost. He told me he was lucky that his family had remained in neutral Switzerland when World War II broke out. 

I thought back to our conversation Thursday when I learned the news of Elias' death. He died peacefully at his home in Basel, Switzerland, at 90, said an announcement posted on the website of Anne Frank Fonds, the foundation that Elias headed. 

Like millions of people who read "The Diary of Anne Frank," I was deeply influenced by her words and in awe of her family's courage. 

Anne received her diary on her 13th birthday and wrote in it for the two years that her family hid from the Nazis in the secret annex of an Amsterdam apartment. I was only in seventh grade when my father bought me the book in 1975.  What are the answers to this following set of questions: 1. Who is the man who is the focus of the story?
2. What is his name?
3. What is the name of his wife?
4. How old was Elias at his death?
5. What country was he in when he died?
6. What country was he in when WWII started?
7. Where did the author of this article meet him?
8. Did Anne and Elias look as if they were related?
9. What place did Anne Frank spend time hidden?
10. What did Anne write in?
11. How old was she when she got it?
12. For what occasion did she receive it?
Answer: 1. Anne Frank's Cousin
2. Buddy Elias
3. Gerti
4. 90
5. Switzerland
6. Switzerland
7. In a hotel in Atlanta
8. yes
9. An annex in Amsterdam
10. her diary
11. 13
12. her birthday

Joey got a German Shepherd for his birthday present. He had never had any pets before, but was always excited to see the other dogs and cats in his neighborhood. Since his birthday was in June, he spent a lot of time playing outside with his new puppy, which he named Max. Max and Joey would often run through fields in a game of chase. They also liked to go through the small forest behind the house, making a game of hide and seek. They never went near the lake because Joey was afraid of water. One day, Max hid a little too well and Joey couldn't find him. Joey spent the afternoon looking for his German Shepherd where they often played, like the field and forest. Joey was a shy boy who often read by himself, and Max was his best friend. After dinner, he went to look for Max one last time before he had to take a bath and go to bed. He heard some barking on the next street, so he ran to see if it was his puppy. Sure enough, he saw Max playing with a poodle. The dogs were having so much fun. Joey brought Max home, happy that he had his puppy back. Max seemed to be happy to have his human by his side as well as a new doggy friend. All summer long, Joey took Max to the poodle's house so they could play without having to worry about losing his present. What are the answers to this following set of questions: 1. who celebrates their birth in the summer?
2. what was he afraid of?
Answer:
1. Joey.
2. Water.