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ganeshie8 Group TitleBest ResponseYou've already chosen the best response.0
you have two arcs of radius 10
 10 months ago

ganeshie8 Group TitleBest ResponseYou've already chosen the best response.0
each arc is measuring exactly 1/4th of circle (why ?)
 10 months ago

ganeshie8 Group TitleBest ResponseYou've already chosen the best response.0
so you can calculate the perimeter of shaded region ?
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
so.. if i get the arc measures.. i'll just add both then i can already have the perimeter?
 10 months ago

Andras Group TitleBest ResponseYou've already chosen the best response.1
Do 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)
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
my answer is.. P=900, is it correct?
 10 months ago

Andras Group TitleBest ResponseYou've already chosen the best response.1
Seems wrong. \[\pi \] Is missing for sure.
 10 months ago

Andras Group TitleBest ResponseYou've already chosen the best response.1
What is the perimeter of a circle with radius=r?
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
15.71 ?
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
62.83
 10 months ago

Andras Group TitleBest ResponseYou've already chosen the best response.1
Do 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?
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
yep, perimeter's 62.83 approximately
 10 months ago

Andras Group TitleBest ResponseYou've already chosen the best response.1
If 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?
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
1/4 of the circle
 10 months ago

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

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

Andras Group TitleBest ResponseYou've already chosen the best response.1
\[solution: P=10\pi \]
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
15.71.. so.. 31.42 :)
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
did i get it right?
 10 months ago

Andras Group TitleBest ResponseYou've already chosen the best response.1
Yes 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 \[10 \pi \]
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
Hahah, yeah maybe. Alright. Got that. Thank you sooo much:)
 10 months ago

Kainui Group TitleBest 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.
 10 months ago

Andras Group TitleBest ResponseYou've already chosen the best response.1
You might be right but that hurts my soul :(
 10 months ago
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