mathematices+activity

Rope mathematices

During the math time, Mr. Stevonson gave us a math challange. He said not many people got the right answer. So it made me really excited. I really wanted to solve the problem. Here's the question :

'There are very large land and you sell the area to someone. The girth must be 120m. And for each square meter, It costs 3000$. How large it will be? '



He also gave us an example. I think this was the trick. :

'Look at the 30*4 square. The dimension of it is 900. So it costs 900*3000=2700000$'

I have read the book before about Diagram. And it said 'circle is the largest shape '. So I decided to calculate my answer with circle shape. Solution:

To figure out the girth of circle, you should know formula first. Circle's girth = 2*pie*radious. Circle's area = pie*radious*radious

At first, I solved pie with 3 but Mr. Stevonson asked me to do it with 3.14. Anyway 120=6.28*radious. So radious is about 19. (The number is too long so I rounded off) So the area is 19*19*3.14= 1133.54 To figure the money, 3000*1133.54= 3400620.

I had to read the number to Mr. Stevonson. Reading a long number was such a difficult job. It was 3 million 4 hundred thousand 6 hundred and twenty.

Anyway I was the first(includin g my friends J and Angela) so Mr.Stevenson cheered us.

I love math though. It was such a nice time. This must need a creative.