Close - they're called concentric circles.
Circles have diameters, rectangles have diagonals.
Twice max.
You can do an experiment on several circles of different diameters.
The diagram you are referring to likely represents two overlapping circles, often used in Venn diagrams to illustrate the relationship between two sets. The dimensions, 9 cm and 5 cm, may indicate the diameters or radii of the circles. If these measurements refer to diameters, the circles would each have a radius of 4.5 cm and 2.5 cm, respectively. If you need a specific arrangement or context for these circles, please provide more details.
yes
Close - they're called concentric circles.
yes
Circles have diameters, rectangles have diagonals.
A diameter is a cord in a circle containing the center of the circle. But some circles are sections of spheres. Not all diameters are diameters of spheres.
NO!!! Diameter refer to circles. A rectamgle has a DIAGONAL.
only if the circles have a different circumference
Twice max.
True providing that they have the same diameters
You can do an experiment on several circles of different diameters.
A rectangle is an elongated square. It doesn't have a diameter; only circles have diameters.
If you mean ratio then I don't quite understand the question.. but if you mean RADIUS Then you take the diameter and divide it by two. ============================================== There's no such thing as the ratio of circles. You can find the ratio of their diameters, the ratio of their radiussesses, and the ratio of their areas. -- The ratio of their diameters is: One diameter divided by the other one. -- The ratio of their radiusses is the same number as the ratio of their diameters. -- The ratio of their areas is the square of that same number.