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Mathematics 17 Online
OpenStudy (anonymous):

A concave polygon looks like it collapsed or has indentations. I believe it is false, but I want to be sure about this one.

jimthompson5910 (jim_thompson5910):

what is the definition of a concave polygon?

OpenStudy (anonymous):

A polygon that is a straight line that cuts it in four or more points..right?

jimthompson5910 (jim_thompson5910):

good or a polygon where at least one interior angle is larger than 180 degrees

jimthompson5910 (jim_thompson5910):

something like this is convex |dw:1373870127406:dw|

jimthompson5910 (jim_thompson5910):

and something like this is concave |dw:1373870161031:dw|

jimthompson5910 (jim_thompson5910):

notice how this interior angle here |dw:1373870182902:dw| is larger than 180 degrees

OpenStudy (anonymous):

So it's a concave polygon?

jimthompson5910 (jim_thompson5910):

so saying "A concave polygon looks like it collapsed or has indentations. " is definitely true

jimthompson5910 (jim_thompson5910):

yes the second one is concave

OpenStudy (anonymous):

Alright, thank you. I understand this better now. ^^

jimthompson5910 (jim_thompson5910):

ok great, you're welcome

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