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Mathematics 27 Online
OpenStudy (anonymous):

Can you check my answer's?!?!?!?!?

OpenStudy (anonymous):

Which figure has rotational symmetry?

jimthompson5910 (jim_thompson5910):

what did you get

OpenStudy (anonymous):

sorry the 3rd one?

jimthompson5910 (jim_thompson5910):

can you rotate that figure some number of degrees (between 0 and 360...excluding both 0 and 360) so that it lines up with itself?

OpenStudy (anonymous):

umm im not really sure

OpenStudy (anonymous):

the Diamond !!!!!!

OpenStudy (anonymous):

u can rotate any degrees and it's still the same

jimthompson5910 (jim_thompson5910):

try to draw it out on paper and rotate it around

jimthompson5910 (jim_thompson5910):

no Untamed_Being, not just "any degrees", but it does have some rotational symmetry

jimthompson5910 (jim_thompson5910):

only a circle can be rotated any number of degrees and it won't change

OpenStudy (anonymous):

Does the figure have rotational symmetry? If it does, find the angle of rotation. (1 point) yes; 30° yes; 60° *yes; 72° no

OpenStudy (anonymous):

true @jim_thompson5910

OpenStudy (anonymous):

@jim_thompson5910

jimthompson5910 (jim_thompson5910):

good, 360/5 = 72 is its angle of rotation

OpenStudy (anonymous):

okay Find the coordinates of the image of point R(3, –5) rotated 180° about the origin. (1 point) *(–3, 5) (–5, –3) (5, 3) (3, –5)

OpenStudy (anonymous):

@jim_thompson5910 ??

jimthompson5910 (jim_thompson5910):

(–3, 5) is correct

OpenStudy (anonymous):

a;right Does an 8-car Ferris wheel have rotational symmetry? Explain. my answer: Yes, because you could spread the ferris wheel in more than one way and since the ferris wheel is a circle shape, it would be symetrical anyway but as long as the ferris wheel can be spread and have four carts on either left or right side or up and down it will be symetric.

jimthompson5910 (jim_thompson5910):

yes as long as you have two seats that are joined by a line segment that runs through the center, you'll have rotational symmetry of some kind the best way to have rotational symmetry is to distribute the seats evenly around the circumference

jimthompson5910 (jim_thompson5910):

so if there are 8 seats, then the arc measure between each seat is 360/8 = 45 degrees

OpenStudy (anonymous):

okay thanks

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