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The area of a circular ring is 90 if the radius of the outer circle forming the ring is 9 what is the radius of the inner circle of the ring assuming the circles forming the ring have same center?
Wiki User
∙ 14y ago
Outer radius = a; inner radius = b; then area of the ring = pi (a2 - b2) = 90, where pi = 22/7. In view of a = 9, we have b2 = 81 - [90 x 7 / 22], the positive square root of which gives b.
Wiki User
∙ 14y ago
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What are circles having the same center?
concentric circles
Is the center of a circle the point of intersection for two concentric circles?
Concentric circles are the circles with the same center therefore they do not cross with each other as the "center is not considered a point on the circle". An exception would be two circles that are concentric and have the same radius, in which case the circles are indistinct and every point of the circles is an intersection.
Do tangent circles have the same center?
No, tangent circles do not have the same center. They just touch at the side. Here is an example:
What are concentrate circles?
AnswerThat would be circles with different sizes, having the same center.AnswerConcentric circles have a common center and different radii.Bulls eye could be an example of concentric circles.ans; Concentric circles are nothing but 2or more circles having common center but having different radius.Source: www.icoachmath.com
Is it possible to have five circles with the same center?
Yes. The circles can be of different size. These are called concentric circles.
Why are animal cells circles?
this is because the nucleolus that is the center of it is circular and and as it grows it just starts growing around it, that's why it circular.
What is a force called that causes and object to move in circles?
The force that causes an object to move in circles is called centripetal force. It acts towards the center of the circular path and is responsible for maintaining the object's circular motion.
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Circles in the same plane with the same center?
Circles in the same plane with the same center are concentric circles.
Are circles in the same plane and having the same center congruent circles?
Yes, it is. Circles that are in the same plane and having the same center are called congruent circles.
What are circles with the same center called?
concentric circles
What are circles having the same center?
concentric circles
A map feature consists of contour lines forming concentric circles What does this represent on the ground?
Contour lines forming concentric circles typically represent a hill or a peak on the ground. The circles indicate a higher elevation point with each circle representing a certain elevation level.
Is the center of a circle the point of intersection for two concentric circles?
Concentric circles are the circles with the same center therefore they do not cross with each other as the "center is not considered a point on the circle". An exception would be two circles that are concentric and have the same radius, in which case the circles are indistinct and every point of the circles is an intersection.
What is two or more circles with same center called?
Concentric circles.
What is the force that causes objects to move in circles?
The force that causes objects to move in circles is called centripetal force. This force acts towards the center of the circular path and is necessary to keep an object moving in a curved trajectory. Without centripetal force, the object would continue moving in a straight line.
Two or more circles with the same center are?
Concentric circles
