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AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Ok how does angle C equal 20 and PS is 5?

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Unkle it's not that hard come on...

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1there are 360° in a complete revolution, angle C is 1 eighteenth of the wayround \[\angle C=360°/18\]

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0wait what so how its it 20 on there?

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1did you simplify \(\angle C =\frac{360°}{18}=\dots\)

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1\[36=2\times18\] \[360=2 \times 18\times10\]

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0How would you find the area?

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1well the shape can be see as 18 of those little right angled triangle joined together, find the area of one then multiply by 18

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1338432746562:dw

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0I have a diferent problem on my notes.. Same shape but it says each side = 4

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1you can find length CS = a using a trigonometric function of the angle 20°

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Lets say the question only give you the length of one side is 4

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0How would you go about finding the area?

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1338432905847:dw

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Thats all it gives you. Find the area. I know it has something to do with finding the apothem and finding the perimeter and using the TAN function.

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Half of one side is 2.

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1\[\tan(20°)=\frac{\text{opposite}}{\text{adjacent}}=\frac5a\] \[a=\frac 5{\tan(20°)}\neq4\]

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1or is the 4 coming from a different problem/

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1the diagram posed at the top of the page does not have any side length equal to 4

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.04 from a different problem

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1OK, what is the new problem exactly/

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0What I drew that's all it gives me

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0A decagon with a side lengths of 4. Find the Area.

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1well the first one was a nonagon so the picture is wrong

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0RAWRRRRRRRRR I HATE MATH SO MUCH OMFG

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1338433609250:dw

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0I DONT HAVE TIME FOR THISSSS I WANNA SLEEP

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Yes now find the area. Just with that information.

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1well should i sing you a lullaby instead ?

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1ok so you might want to find the angle in triangle first, remember there are 360° in a revolution and i count 10 angles, so the angle in is \[360°/10\]

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1next find the length of the perpendicular , using the angle you just found and the tangent function

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1338433908040:dw, find the area of the triangle and lastly multiply this area by the number of those triangles in the decagon

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0360/10 =36? When I apply the TAN to 36 it's weird...

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1true, what did you determine as an approximation of length b

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.12 significant figures is probably fine

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0huh? I didnt get that far becuase I thought you need to know the TAN of 36

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1yeah \[\tan(36°)\approx0.727\]

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1\[\tan(36°)=\frac{\text{opp}}{\text{adj}}=\frac 2 b\] \[b=\frac {2}{\tan36°}\approx\cdots\]

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1we are trying to find \(b\) so we can work out the are of the triangle \[\tan(36°)=\frac{\text{opp}}{\text{adj}}=\frac 2 b\] multiply both sides by \(b\) then divide both sides by \(\tan36°\)

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1yes \(b\approx 2.75\)

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0so then after we find the area which is 2.752 we take the perimeter which is 40, and do 1/2* 2.752* 40

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1find the area of this triangle dw:1338435087210:dw

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1\[A_{\triangle}=\frac{ab}2=\frac {2b}2=\cdots\]

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1you dont need the perimeter

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Maybe hes teaching it like that?

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0THe formula for Area is. 1/2 * Apothem * perimeter

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.1whatever, my method is better ~ so the area of the small right angled triangle is 2.752 and there are 20 of these in the decagon the the total area is simply \(A_{decagon}=2.752\times20=\cdots\)

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Yeah lol same thing I got.

AcidRa1n
 2 years ago
Best ResponseYou've already chosen the best response.0Well, thanks for taking like 30 minutes of your time to help me lol.
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