A chemical company makes 2 brands of antifreeze. The first is 40% pure, and the second brand 65% pure. In order to obtain a mixture that is 55% how many gallons of each

The bigger circle is exactly 2 times bigger than the small one. Not sure how to explain it, but ill give it a try

The radius of circle D is 2. The radius of circle B is 4.

Use a scale factor of 2 to dilate the image of circle D.

This newest image is exactly the same as circle B.

That proves the circles are similar.