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Find the area of the regular polygon. Give the answer to the nearest tenth. Decagon with a side of 4 cm.
 8 months ago
 8 months ago
Find the area of the regular polygon. Give the answer to the nearest tenth. Decagon with a side of 4 cm.
 8 months ago
 8 months ago

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OpenSessameBest ResponseYou've already chosen the best response.0
Can you help please??
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
@koymoi can you help?
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
I know the answer i just dont get how to get there.
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
do you know how many sides a decagon has
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
yes, now how many triangles of the same shape can we get from a decagon? I will give you lil bit hint in the pic below:
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
ok, now what we need to do is to figure out how to work out the area of one of those little triangle.
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
to do that, we need to get each inner angle of the decagon first. use this formula: 180(n2)÷n n=sides in this case, since decagon has 10 sides, so n=10
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
okay so the angle would be 72?
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
Uhm...Its the same length on both sides...right?
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
dw:1376884123072:dw
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
Wouldnt you need to know the interior angle though?
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
Wait its regular so all of them are the same!
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
that triangle is isosceles triangle, not equilateral triangle
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
But its a regular decagon...
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
dw:1376884408466:dw
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
dw:1376884457513:dw
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
yes thats why its isosceles. the only way to make it equilateral is when all the interior angles equals to 60 degrees.
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
I meant the outside angles lol
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
and since we have 10 of them triangles, so you just multiply by 10 to get the area of the decagon.
 8 months ago

koymoiBest ResponseYou've already chosen the best response.4
and dont forget to round it to the nearest tenth
 8 months ago

OpenSessameBest ResponseYou've already chosen the best response.0
I think i get it now since i know the final answer. THANKS:)
 8 months ago
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