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What is the area between two circles with the same centre and of radii 5cm and 9cm respectively?
To find the area between two circles with the same center, you need to subtract the smaller circle's area from the larger circle's area. The formula for the area of a circle is A = πr^2, where r is the radius. So, the area between the two circles is calculated as A = π(9^2) - π(5^2) = 81π - 25π = 56π square cm.
What else can I help you with?
What are Circles having same centre but different radii called?
Concentric circles are circles with the same common centre.
Are the radii of congruent circles equal?
Yes
Circles that lie in the same plane and have the same center but different radii?
concentric circles
What are congruent circles?
Circles that have congruent radii. Congruent=coinciding at all points when superimposed (http://dictionary.reference.com/browse/congruent)
What do you call a quarter of a circle?
A quarter of a circle, formed by two radii forming a right angle at the centre, is called a quadrant.
What are Circles having same centre but different radii called?
Concentric circles are circles with the same common centre.
What is the relationship between two circles?
Their circumferences are in direct proportion to their radii. Their areas are in direct proportion to the square of their radii.
Circles that have congruent radii?
Congruent circles
What are tangent circles?
Tangent circles are circles that touch one another without crossing. The distance between the centres of the circles must be equal to the difference or the sum of their radii.
How many radii does a circle have?
A radii is just a plural form of radius. A circle doesnt have one radius. The term radii is mostly used when talking about multiple circles.
What is 2 circles of same radii called?
They are congruent circles
Two or more circles with congruent radii?
Are congruent circles.
What are circles who radii have the same length?
They are congruent or identical circles
What are circles called with the same centre points?
Circles that have the same center point are referred to as concentric circles. These circles can have different radii, resulting in varying sizes, but they share the same center. This arrangement is often seen in designs and patterns, illustrating the concept of concentricity in geometry.
Two or more circles with congruent radii are called?
Congruent circles
Are the radii of congruent circles equal?
Yes
What is the relationship between area of a circle and its radius squared for a series of circles with large increasingly large radii?
The area of a circle is directly proportional to the square of its radius. If two circles have radii R1 and R2 , then the ratio of their areas is ( R1/R2 )2
