The equation for a circle is generally written in the form (x+a)^2+(y+b)^2 = r^2
Remember, for the centres for the x and y value, they go in the opposite direction of the rule.
So:
if the centre is (-2,-4), the equation of the circle is (x+2)^2+(y+4)^2=9
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
measure it
The centre is (3,-1) and the radius is sqrt(10).
the radius is half of the diameter. and the middle of the circle is half way between this diameter.
The diameter of a circle is simply twice the radius of the circle. The radius is a line that starts from the center of the circle to the circumference of the circle. The diameter is a line that passes through the circle. diameter=2xradius
# Find the center of the circle # Draw the line of the radius from the center to the circumference # Finish
x2+y2+4x+2y+3=0(x+2)2 + (Y+2.5)2 = 3This is the equation of circle with center at (-2,-2.5) with radius 3.5
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
measure it
the radius is from the center of the circle to the edge so that's how you find the radius.
There are probably several ways to approach it; one general equation for the circle is: (x - a)2 + (y - b)2 = r2 This describes a circle with center at coordinates (a, b), and with a radius of r.
The inner circle is x2 + y2 = 4. The radius of the inner circle is the square root of 4, which is 2. To find the radius of the outer circle, multiply 2 times 4. The radius of the outer circle is 8. Square 8 (82 or 8 x 8) to find the number to put into the equation of the outer circle. This is 64. The equation for the outer circle is x2 + y2 = 64.
The centre is (3,-1) and the radius is sqrt(10).
Equation for the area circle = pi x radius squared If the area is 144pi, then you need to find the square root of 144, which is 12. Therefore, radius = 12
The diameter of a circle is 2 times the radius. The radius of a circle is the distance from any point on the circle to the center of the circle, and the diameter is the distance from one side of the circle to the opposite side, passing through the center.
the radius is half of the diameter. and the middle of the circle is half way between this diameter.
The diameter of a circle is simply twice the radius of the circle. The radius is a line that starts from the center of the circle to the circumference of the circle. The diameter is a line that passes through the circle. diameter=2xradius