Equations of Circles
Where is the center of a circle with equation
(x+4)2+y2=25
(-4, 0)
What is the equation of the circle with center (0, ) and radius 7.
x2 + y2 = 49
Determine the midpoint between the two coordinates
(2, 6) and (4,6)
(3,6)
Determine the distance between the points (3, 6) and
(2, 8) using the distance formula.
Square root of 5.
Use correct vocab to describe the transformation shown between the two points below:
(-3, 5) --> (3, 5)
Reflected across the y-axis
What language did Mr Feller take in high school?
French
What is the radius of the circle with equation
x2+(y+38)2 = 9
r = 3
Create an equation for a circle with a center at (-5, 8) and a radius of 15
(x+5)2 + (y-8)2 = 225
Determine the midpoint between the two points
(5, 9) and (-3, 13)
(1, 11)
Determine the distance between the two points (-2, 8) and (-5, 12)
5
After being translated left 7 units, where will the point (1, 7) end up?
(-6, 7)
Is Mr Feller wearing a pin on his shirt today?
nope.
Determine the center of a circle with equation
x2+(y+5)2= 64
(0, -5)
Create the equation for a circle with a center at
(-2.5, 4.8) and a radius of 1.5
(x+2.5)2 + (y-4.8)2 = 2.25
Determine the midpoint between the two points
(2.5, 4.8) and (4.1, 6.8)
(3.3, 5.8)
Determine the distance between the two points
(-4.2, 10.8) and (.4, -4)
15.5
For the point (2, 10), translated down 4 and translate right 5. Where will it end up?
(7, 6)
What is Mr Feller's brother's name?
What is the diameter of a circle with equation
(x-238)2+(y+362)2 = 4
A circle has a diameter of 16, and a center in the dead center of the coordinate plane (called the origin)
Create an equation for this circle.
Where is the center of a circle with equation
x2 + y2 = 64
Given that a diameter of a circle has an endpoint at
(2,8) and a midpoint at (4, 12), what is the other endpoint of the diameter?
(6, 16)
A student starts creating a circle equation, and gets this far:
(x-3)2+(y-2)2= ?
Given that the point (5, 4) is on the edge of the circle, find the missing number "?"
2.83
For the point (4, -2), reflect it across the y axis, and then translate it down 5
(-4, -7)
When during May is your Geometry EOC?
The 2nd week in May.
Is the point (-4,6) on the outer arc of this circle?
(x+4)2+(y-3)2=9
How do you know?
Yes. Plug the coordinates into the equation for the circle. Since it makes the equation true, that means it is on the circle, itself.
(outer arc is a weird way to say edge of circle)
What do you need to do to the distance formula to make it look like the formula for the equation of a circle?
Square both sides of the equation. DO NOT expand the parentheses.
A line segment has an endpoint at (-4.2, 8.1) and a midpoint at (-9.2, .6). Determine the measure of the other endpoint
(-14.2, -6.9)
Look at the two points Feller has graphed on the front whiteboard. What is the distance between them?
...anyone?
For the point (2, 6), reflect it across the x axis, and then dilate it by a factor of 2.
(4,-12)
What is Mr Feller's classroom number at Boyd Anderson High School?
561