4
9 (APEX)
11 = sqrt of 121. it is a circle centred on the origin think what would happen on the line x=0 (The y axis) the equation simplifies to y2 = 121 or y =11 you can also think of eqn of a circle as x2+y2=r2
The radius is 1/2 of the diameter. A diameter of 10 has a radius of 5.
there is no length or width of a circle. There is radius and circumference and the line that goes all the way through the center to the other side of the circle, which is twice the radius. But there is no length or width of a circle.
The ratio of radius to diameter for any circle is 1/2
The center of a circle is the same for all circles but the length of the radius can change
Radius = 1111
The equation for any circle is r2 = (x-a)2 + (y-b)2 Where r is the radius and the centre of the circle is (a,b)
x2 + y2 = 25
x2 + y2= 16
x2 + y2 = 25
x2 + y2 = 36
x2 + y2 = 49
The equation x^2 + y^2 = 169 represents a circle centered at the origin with a radius of 13 units.
Unless the chord is the diameter, there is no way to measure the radius of the circle. This is because the radius is in no way dependent on chord length since circles have infinite amount of chord lengths.
C=2(3.14)rThis is circumference equation for circles. If you have the circumference, you need to input it into the equation and solve for r. r is the radius of the circle, so to determine the diameter, which is 2 times the length of the radius, you just need to multiply the number you got for r times 2.
Circle A has more area than B