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The formual for area is: A = πr2 so the area of circle A (assuming π=3.142) is 28.278cm2, and the area of circle B is 50.272cm2.
Their combined area of 78.55cm2 is the area of circle C.
The formula for radius is: square root of A/π
78.55 ÷ 3.142 = 25, the square root of 25 is 5
The radius of circle C is 5cm
Area of Circle A = π32 = 9π
Area of Circle B = π42 = 16π
Area of Circle C = 9π + 16π = 25π
Let r = radius of Circle C then
πr2 = 25π : r2 = 25 : r = 5.
What else can I help you with?
What undefined term is needed to define a circle?
A point. To learn why and more about circles go to this website: windowseat.ca/circles
Do concentric circles have the same circles?
No. You can only define a circle by radius, diameter, area, perimeter. Concentric circles have the same centre, therefore, if they were the same circles with the same radius, then they would all lie on top of each other and be effectively one circle.
Is concentric circle and congruent circle are they same?
No. Concentric circles have the same centre but not [usually] the same radius. Congruent circles have the same radius, but not [usually] the same centre. If you have two concentric congruent circles one will be exactly on top of the other.
How do you determine the length of the radius on a circle?
The radius of a circle is defined as the distance from the centre-point to the circumference.
A large circle has a radius of 10cm Given four congruent circles tangent to one another within the large circle what is the radius of the largest circle which will fit in the middle?
Letting x be radius of the 4 circles, then (squareroot(2x^2))+x=10, or x(1+sqrt2)=10. Then radius of circle in middle is ((2*10)-4x)/2. So I get radius of circle in middle = 1.715729 approximately.
If two circles have the same center one with a 3 centimeter radius the other with a 1 centimeter radius What is the equidistant from the two circles?
If you create third circle with radius 2, then all the points on that circle would be equidistant form both circles. So the answer is a circle with radius 2.
If a circles radius is 2.5cm what is the diameter?
The diameter of a circle is twice the radius.
What undefined term is needed to define a circle?
A point. To learn why and more about circles go to this website: windowseat.ca/circles
What happens if you triple the radius in a circle?
nothing you will just just get the radius in 3 circles.
Can a circle be drawn with any center and any radius?
The center of a circle is the same for all circles but the length of the radius can change
Do concentric circles have the same circles?
No. You can only define a circle by radius, diameter, area, perimeter. Concentric circles have the same centre, therefore, if they were the same circles with the same radius, then they would all lie on top of each other and be effectively one circle.
Is concentric circle and congruent circle are they same?
No. Concentric circles have the same centre but not [usually] the same radius. Congruent circles have the same radius, but not [usually] the same centre. If you have two concentric congruent circles one will be exactly on top of the other.
What fraction of the area of a circle of radius 5 lies between concentric circles of radius 3 and 4?
The area of a circle with radius 5 is 25 pi. Concentric circles with radius 3 and 4 have areas of 9 pi and 16 pi. The concentric circle with radius four consumes the circle with radius 3. 25 pi minus 16 pi leaves 9 pi of the circle with radius 5 left over. 16 pi is slightly over three-fifths of the circle with radius 5.
How do you determine the length of the radius on a circle?
The radius of a circle is defined as the distance from the centre-point to the circumference.
Is the ratio of the radius to the diameter of all circles?
The ratio of radius to diameter for any circle is 1/2
A large circle has a radius of 10cm Given four congruent circles tangent to one another within the large circle what is the radius of the largest circle which will fit in the middle?
Letting x be radius of the 4 circles, then (squareroot(2x^2))+x=10, or x(1+sqrt2)=10. Then radius of circle in middle is ((2*10)-4x)/2. So I get radius of circle in middle = 1.715729 approximately.
How many circles of radius of 5 degrees can be cut from a cartolina 42cm by 32cm?
It's not a circle if it's radius of 5 degrees. If it's 5 cm radius, then 12 circles.
