Question

Prove that the two circles shown below are similar.

Answer 1

@mathmale

Answer 2

The diameter of the first circle is 8, and the diameter of the second circle is 4.

Answer 3

yes...

Answer 4

yes

Answer 5

how does that mean they are similar?

Answer 6

The second circle was just a resized version of the first.

Answer 7

Meaning these are also similar.

Answer 8

okay, what else makes them similar?

Answer 9

could i say the 2nd one was dilated by 2?

Answer 10

Well, the second one was actually dilated by .5

Answer 11

thats what i mean lol but i think i have to do a translation or something in order to reciever credit

Answer 12

Scale factor:
.5 is basically half the size.
2 is double the size.

Answer 13

i got it thanks i have to do a translation and then a dialation

Answer 14

http://www.mathsisfun.com/geometry/similar.html

This is helpful too.

Answer 15

It tends to be pretty impossible to tell if a circle is reflected, translated, or rotated.