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What is the average area of all circles with radii between 3 inches and 6 inches?
Wiki User
∙ 10y ago
1/3 [definite integral, interval [3,6]]((pi)r2)
1/3 (((pi)r3)/3) interval [3, 6]
1/3 [ (72(pi) - 9(pi) ]
1/3 [ 63(pi) ]
21pi
Sorry about the set-up, could not figure out how to do all of the equations.
Wiki User
∙ 10y ago
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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 Circles having same centre but different radii called?
Concentric circles are circles with the same common centre.
What are congruent circles?
Circles that have congruent radii. Congruent=coinciding at all points when superimposed (http://dictionary.reference.com/browse/congruent)
What is the area between two circles with the same centre and of radii 5cm and 9cm respectively?
It is pi*(92 - 52) = pi*(81 - 25) = pi*56 = 175.93 cm2
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.
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
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
Circles that lie in the same plane and have the same center but different radii?
concentric circles
What are Circles having same centre but different radii called?
Concentric circles are circles with the same common centre.
Why was the formula for finding the circumference of a circle invented?
Because it was found that there was a direct relationship between the radii (or diameters) of circles and their circumferences.
