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

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

ganeshie8 Group TitleBest ResponseYou've already chosen the best response.0
so you can calculate the perimeter of shaded region ?
 9 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?
 9 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)
 9 months ago

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

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

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

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

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
62.83
 9 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?
 9 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
yep, perimeter's 62.83 approximately
 9 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?
 9 months ago

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

Andras Group TitleBest ResponseYou've already chosen the best response.1
Correct, thus one arc has perimeter: \[\frac{ 1 }{ 4 } 2\pi r \]
 9 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. \[2*\frac{ 1 }{ 4 } 2\pi r =\pi r\]
 9 months ago

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

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

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
did i get it right?
 9 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 \[10 \pi \]
 9 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
Hahah, yeah maybe. Alright. Got that. Thank you sooo much:)
 9 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.
 9 months ago

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