radius of a circle is 15x what is the diameter?
81834
A radius is half of a diameter. So the diameter is twice the radius. Multiply 15x by 2 and you get:\n\n30x
747405
15 inches\nThe side of a regular hexagon inscribed in a circle is the same as the radius of the circle. In fact, if you connect the center of the circle to each vertex of the hexagon (with a straight line segment), then you will have 6 equilateral triangles that all meet at the center of the circle.
178476
Diameter is two times the radius.\n\nThey may want you to calculate the mean (average), median, or mode of the 12 values.\n\nIt would be best if you would give more details.
763047
Angle 2*pi is one revolution, so this arc is the circumference!\n2*pi*radius = 18*pi\n\nThere is also the general formula \narc length = radius * angle (in radians), which of course gives exactly the same result here.  But after 2 hours I guess you're not there to see this answer!  Sorry no-one responded earlier.
401455
Sorry.  This is going to be a little rough, typing the answer.  Here it goes:  \n(x-2)2(squared)+ (y-4)2 (squared)= 25\n\nYou find the midpoint between the two points for the center.  You find the distance between the two points for the diameter and divide that in half for the radius which equals 5.  The center is (2,4).  You square the radius and that is what comes after the equals sign.\n\nThe guy who entered before me is wrong.  I promise.
447001
pie times radius squared
237156
Pi * r^2\n\n(Pi R Squared)\n\nwhere R is the radius (which is also equivalent to half the diameter)
323605
Area of a circle = pi x r^2 =3.1416 x 4^2=50.265 cm^2\nArea of a circle = pi x (d^2)/4 = 3.1416 x (8^2)/4 = 50.265 cm^2\n\nCircumference of a circle = pi x diameter = 3.1416 x 8 =25.133 cm\nCircumference of a circle = pi x 2 x radius = 3.1416 x 2 x 4 =25.133 cm
312528
The radius of a circle is the distance from the center of the circle to the edge of the circle.
522790
Circumference = 2*radius*pi\n\nTherefore, the radius is 30\n\nand the diameter is 60..\n\nHope that helps...
392733
Divide the circumference of a circle its diameter.
249445
The constant pi times the radius squared
408251
Measure the diameter and multiply by pi (3.1415)
114473
If circumfrence = C (assume)\n   radius = r       (assume)\n   pi     = 3.14  or 22/7  (known value)\n\nthen :   C= 2 x (pi) x r \n          = 2 x  3.14 x 31/2\n          = 3.14 x 31   ( 2 gets cancelled out from the \n                          numerator and denominator)\n\n          = 97.34 units ( answer)
100213
Diameter will be 1 units\n\nCircumference =piD\nif Circumference =pi\nthen D=1
1088174
area = pi times the radius squared\n\nThe diameter is twice the radius.\n\nSo divide the diameter in two, square that and multiply by pi.
181035
a circle's circumference is define as 2Pi x Radius\n\nin this case 2 x 3.14... x 3 so your answer is c