Area of the 10 regular polygon is 770cm^2 and the gap between the parallel line is 30,8cm. Find its circumference. Yeah, I'm going to fail on this subject.
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Do you mean decagon? – Bernard Feb 04 '15 at 18:09
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1Consider the ten triangles formed by linking each edge to the centre. – Joffan Feb 04 '15 at 18:11
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decagon sorry :D – naaame Feb 04 '15 at 18:17
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"the gap between the parallel line"? – Greg Martin Feb 04 '15 at 18:26
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Yeah.. I really don't know but when I translate it comes out "The gap between the parallel line the sides 30,8 something like that. – naaame Feb 04 '15 at 18:29
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Consider the ten triangles formed by linking each edge to the centre as shown:
You should be able to get the base of the triangle from here, then the entire perimeter.
Joffan
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