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Starr_DynastyT Group TitleBest ResponseYou've already chosen the best response.0
@shamil98
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
A= big semicircle.. what's next?
 10 months ago

MayankD Group TitleBest ResponseYou've already chosen the best response.1
Just remove the semicircle on the left and place it in the gap on the right
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
this is SAT yes? I remember this one
 10 months ago

Haleo Group TitleBest ResponseYou've already chosen the best response.0
\[a= \pi*r ^{2}\] \[a= ( \pi * 10^{2} ) /2 = 157.079\]
 10 months ago

Haleo Group TitleBest ResponseYou've already chosen the best response.0
Isn't it right?
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
dw:1389510061781:dw
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
dw:1389510085539:dw
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
dw:1389510103621:dw so the area is equivalent to just the top semicircle... we merely moved the piece under the line to fill the hole to the right
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
the radius is very clearly \(r=10\) ergo the area is \(A=\pi r^2=\pi(10)^2=100\pi\)
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
dw:1389510292746:dw
 10 months ago

liliegirl Group TitleBest ResponseYou've already chosen the best response.0
It is a semicircle so you need to divide by 2. The answer is 50pi + 25pi over 2. \[\frac{ 75\pi }{ 2 }\] is the answer.
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
oops  good catch. you do need to multiply by \(1/2\) to get just the top:$$\frac12\cdot100\pi=50\pi$$that being said, it is NOT \(\frac12(50\pi+25\pi)\)
 10 months ago

liliegirl Group TitleBest ResponseYou've already chosen the best response.0
dw:1389510798177:dw
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
so.. also find that part and add it?
 10 months ago

liliegirl Group TitleBest ResponseYou've already chosen the best response.0
You need to add that because it is also shaded. The area of that part is 25pi over two.
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
@liliegirl that part is precisely the part we moved to fill in the top semicircle. it is now accounted for...
 10 months ago

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

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
so.. the answer is.. 314.16 right? thanks guys
 10 months ago

liliegirl Group TitleBest ResponseYou've already chosen the best response.0
@oldrin.bataku Ahhh, Sorry, I didn't notice.... :)))
 10 months ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.1
@stupidinmath no it's half of that, i.e. \(50\pi\)
 10 months ago

stupidinmath Group TitleBest ResponseYou've already chosen the best response.0
oh.. since its a semi circle.. k thanks :)
 10 months ago
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