Concentric Circles

Author:
Accesscd
Topic:
Circle
The circles below are concentric. Each slider controls the circle with the matching color. Adjust the sliders to alter the size of the circles. 1. Which color slider allows the largest radius? Which one allows the smallest radius? 2. What do you have to do to get the concentric circles congruent (to lay on top of one another)? 3. Can you set up two sets of congruent circles?