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anonymous
 one year ago
Circle B has a center of (−1, 5) and a radius of 4. Circle D has a center of (7, 4) and a radius of 2. Prove that the two circles are similar.
anonymous
 one year ago
Circle B has a center of (−1, 5) and a radius of 4. Circle D has a center of (7, 4) and a radius of 2. Prove that the two circles are similar.

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Jack1
 one year ago
Best ResponseYou've already chosen the best response.0similar how...? all circles are similar...? circle d is just like 1/2 the size of circle b, sáll

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I know i'm just confused on this question!:/

Jack1
 one year ago
Best ResponseYou've already chosen the best response.0i dont really understand... with triangles they can have different shapes so it makes sense when trying to prove they're similar... but all circles are the exact same shape... i dont get it either, sorry ;(

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thanks anyway but do you know anyone who can?

Jack1
 one year ago
Best ResponseYou've already chosen the best response.0@ganeshie8 lil help if u have a sec man, i'm lost on this one dude...?

Jack1
 one year ago
Best ResponseYou've already chosen the best response.0or @dan815 ? u got a sec? how are circles "similar"?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thanks for trying to help man!:)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@ganeshie8 please help

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@dan815 could you help me on this question please?

Jack1
 one year ago
Best ResponseYou've already chosen the best response.0@IrishBoy123 ur pretty cluey, du u understand this Q man?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@phi i really need help with this question!

phi
 one year ago
Best ResponseYou've already chosen the best response.4similar means the objects have the same shape (but possible different sizes) if we take two objects and "scale" one to be the same size as the other, and then show they can be laid on top of the other, that would show they are similar.

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1https://www.illustrativemathematics.org/contentstandards/tasks/1368 is any of this familiar to you you move one circle onto the other and shrink or enlarge it to prove they are similar

Jack1
 one year ago
Best ResponseYou've already chosen the best response.0circles are always similar tho, right...?

phi
 one year ago
Best ResponseYou've already chosen the best response.4I would start with Circle B has a center of (−1, 5) and a radius of 4 and translate (that means slide it) so its center is at (0,0) (its shape will not change) then shrink it by 2: its radius will go from 4 down to 2

phi
 one year ago
Best ResponseYou've already chosen the best response.4next, Circle D has a center of (7, 4) and a radius of 2. slide D so its center is at (0,0) its radius is 2, and it will lie directly on top of the other circle (which we moved to (0,0) and shrank to radius = 2) this shows the two shapes are identical. Identical shapes mean the shapes are similar.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0do I have to determine a rule?

phi
 one year ago
Best ResponseYou've already chosen the best response.4a rule for what ? there is the procedure to translate the circles and shrink (or expand) them so they lie on top of each other. there is the "rule" that all circles are similar...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0do i just picture this in mind or do i draw it?

phi
 one year ago
Best ResponseYou've already chosen the best response.4nobody else can read your mind, so you have to write down something. I would sketch (graph) the original circles then draw an arrow to show they are translated to the (0,0) origin and write down "translate the center of the circle to (0,0)" then show the two circles centered at the origin then shrink the big circle by 2 (multiply its radius by 1/2) and write "use dilation to change the size from radius 4 to radius 2" then show a picture with both circles on top of each other, and write "both circles lie on top of each other, and this shows they have the same shape" "same shape means they are similar"

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay but that's not what it asks in my question! How about the other written part?

phi
 one year ago
Best ResponseYou've already chosen the best response.4they ask, "Prove that the two circles are similar." A proof would be doing all the things I just posted.

Jack1
 one year ago
Best ResponseYou've already chosen the best response.0i;m still not understanding either @phi couldn't we just right "they're circles : QED"?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but I can't take a picture of everything i just drew and put it in my question!

phi
 one year ago
Best ResponseYou've already chosen the best response.4then just write the words that explain what you would do.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'm still really confused

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so i just put what you just wrote but in my own words?

phi
 one year ago
Best ResponseYou've already chosen the best response.4yes. Try to use your own words.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so this part? would sketch (graph) the original circles then draw an arrow to show they are translated to the (0,0) origin and write down "translate the center of the circle to (0,0)" then show the two circles centered at the origin then shrink the big circle by 2 (multiply its radius by 1/2) and write "use dilation to change the size from radius 4 to radius 2" then show a picture with both circles on top of each other, and write "both circles lie on top of each other, and this shows they have the same shape" "same shape means they are similar"

phi
 one year ago
Best ResponseYou've already chosen the best response.4@Jack1 I think this is some goofy "common core" idea. In Euclidean geometry I think it is assumed circles are similar

phi
 one year ago
Best ResponseYou've already chosen the best response.4Yes Josh, but try to rewrite it using your own words.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh okay thank you!:)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it says prove so that would be my proof?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh okay double checking! thanks again!:)

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1@phi awesome work!
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