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Can you help please??

I know the answer i just dont get how to get there.

do you know how many sides a decagon has

10?

|dw:1376882655959:dw|

10

Okay...

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|

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:)