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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.

Mathematics
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Can you help please??
@koymoi can you help?
I know the answer i just dont get how to get there.

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Other answers:

do you know how many sides a decagon has
10?
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:
|dw:1376882655959:dw|
10
ok, now what we need to do is to figure out how to work out the area of one of those little triangle.
Okay...
to do that, we need to get each inner angle of the decagon first. use this formula: 180(n-2)├Ěn n=sides in this case, since decagon has 10 sides, so n=10
144
|dw:1376883184207:dw|
|dw:1376883372359:dw|
No clue
|dw:1376883474402:dw|
okay so the angle would be 72?
|dw:1376883661743:dw|
Uhm...Its the same length on both sides...right?
right.
Would i use trig?
yes you would;)
|dw:1376884123072:dw|
Wouldnt you need to know the interior angle though?
Wait its regular so all of them are the same!
that triangle is isosceles triangle, not equilateral triangle
But its a regular decagon...
|dw:1376884408466:dw|
|dw:1376884457513:dw|
yes thats why its isosceles. the only way to make it equilateral is when all the interior angles equals to 60 degrees.
OHH...
I meant the outside angles lol
I got 6.47
|dw:1376884560108:dw|
OHH...6.15?
|dw:1376884812109:dw|
and since we have 10 of them triangles, so you just multiply by 10 to get the area of the decagon.
1.9?
what is tan72 ?
3.07768
|dw:1376885258455:dw|
now times 10
and dont forget to round it to the nearest tenth
61.55?
I think i get it now since i know the final answer. THANKS:)

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