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

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

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

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

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

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

Andras
 11 months 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
 11 months ago
Best ResponseYou've already chosen the best response.0yep, perimeter's 62.83 approximately

Andras
 11 months 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?

stupidinmath
 11 months ago
Best ResponseYou've already chosen the best response.01/4 of the circle

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

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

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

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

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

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

Kainui
 11 months 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
 11 months ago
Best ResponseYou've already chosen the best response.1You might be right but that hurts my soul :(
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