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stupidinmath
 2 years ago

stupidinmath
 2 years ago


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ganeshie8
 2 years ago
Best ResponseYou've already chosen the best response.0you have two arcs of radius 10

ganeshie8
 2 years ago
Best ResponseYou've already chosen the best response.0each arc is measuring exactly 1/4th of circle (why ?)

ganeshie8
 2 years ago
Best ResponseYou've already chosen the best response.0so you can calculate the perimeter of shaded region ?

stupidinmath
 2 years ago
Best ResponseYou've already chosen the best response.0so.. if i get the arc measures.. i'll just add both then i can already have the perimeter?

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1Do you know what is the perimeter of a full circle? If you do you can find the shaded one. As that is twice the quarter of a circle. Thus 2*1/4=1/2 The perimeter is half of the full circle. (with radius=10)

stupidinmath
 2 years ago
Best ResponseYou've already chosen the best response.0my answer is.. P=900, is it correct?

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1Seems wrong. \[\pi \] Is missing for sure.

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1What is the perimeter of a circle with radius=r?

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1Do not try to jump steps. One at a time, otherwise you will make too many mistakes. So we will start with a circle of any radius=r. This circle has perimeter: \[P=2\pi r \] Is this clear?

stupidinmath
 2 years ago
Best ResponseYou've already chosen the best response.0yep, perimeter's 62.83 approximately

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1If r=10 as in this question. Now next step, first look at one arc of the graph. (half the perimeter asked) What fraction is this arc of the full circle?

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1Correct, thus one arc has perimeter: \[\frac{ 1 }{ 4 } 2\pi r \]

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1We need two arcs, so need to multiply the above equation by 2. \[2*\frac{ 1 }{ 4 } 2\pi r =\pi r\]

stupidinmath
 2 years ago
Best ResponseYou've already chosen the best response.015.71.. so.. 31.42 :)

stupidinmath
 2 years ago
Best ResponseYou've already chosen the best response.0did i get it right?

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1Yes but I am 100% confident that your maths teacher will not like the solution written as 31.42, as it is not precise. The solution is \[10 \pi \]

stupidinmath
 2 years ago
Best ResponseYou've already chosen the best response.0Hahah, yeah maybe. Alright. Got that. Thank you sooo much:)

Kainui
 2 years ago
Best ResponseYou've already chosen the best response.0@Andras Don't be so sure. Often times in courses like this the teacher prefers that you assume pi=3.14, which is probably exactly what his teacher expects since he's already doing it this way.

Andras
 2 years ago
Best ResponseYou've already chosen the best response.1You might be right but that hurts my soul :(
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