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Geometry 9 Online
OpenStudy (anonymous):

http://s28.postimg.org/os2gf2z71/image.jpg (IGNORE WHAT I WROTE)

OpenStudy (anonymous):

@jim_thompson5910

jimthompson5910 (jim_thompson5910):

for part a), how many lines can you draw such that you mirror the figure over that line to have it match up with itself?

OpenStudy (anonymous):

2?

jimthompson5910 (jim_thompson5910):

|dw:1441847366597:dw|

jimthompson5910 (jim_thompson5910):

yes 2 |dw:1441847375437:dw| and |dw:1441847387677:dw|

jimthompson5910 (jim_thompson5910):

now onto part b) is it possible to rotate this figure such that it lines up with the original image? the angle must be between 0 and 360 degrees (not including 360 degrees)

OpenStudy (anonymous):

Yes

jimthompson5910 (jim_thompson5910):

which angle?

jimthompson5910 (jim_thompson5910):

how much do you have to rotate it to make it line up with the original?

OpenStudy (anonymous):

180 degree rotation

jimthompson5910 (jim_thompson5910):

yep

jimthompson5910 (jim_thompson5910):

so because this is possible, this figure does have rotational symmetry

OpenStudy (anonymous):

So the answer for 4b would be Yes, 180 degree rotation

jimthompson5910 (jim_thompson5910):

yep

OpenStudy (anonymous):

Thanks :)

jimthompson5910 (jim_thompson5910):

no problem

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