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QUESTIONS

1- Sketch the circle x2 + y2 = 4.
Find the center and radius first.
     -The equation is in the form x2 + y2 = r2, so we
     have a circle, center (0, 0) with radius r = √4 = 2
2- Sketch the circle (x − 2)2 + (y − 3)2 = 16
Find the center and radius first.

  -The equation is in the form (x − h)2 + (y − k)2 = r2, so we have a
  circle with centre at (2, 3) and the radius is r = √16 = 4.
3- Sketch the circle (x + 4)2 + (y − 5)2 = 36

   -We have a circle with centre at (-4, 5) and the
   radius is r = √36 = 6.
4. Find the equation of the circle with
centre (3/2, -2) and radius 5/2.


        -Centre (3/2, -2) radius 5/2
5- Find the points of intersection of the circle

                    x2 + y2 − x − 3y = 0

    with the line
                     y = x − 1.

   -We solve the 2 equations simultaneously by substituting the expression

                             y = x -1
                        into the expression



      We have:
So we see that the solutions for x are x = 1 or x = 2. This gives the
corresponding y-vales of y = 0 and y = 1.
So the points of intersection are at: (1, 0) and (2, 1).
We can see that our answer is correct in a sketch of the situation:

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Circle questions

  • 1. QUESTIONS 1- Sketch the circle x2 + y2 = 4. Find the center and radius first. -The equation is in the form x2 + y2 = r2, so we have a circle, center (0, 0) with radius r = √4 = 2
  • 2. 2- Sketch the circle (x − 2)2 + (y − 3)2 = 16 Find the center and radius first. -The equation is in the form (x − h)2 + (y − k)2 = r2, so we have a circle with centre at (2, 3) and the radius is r = √16 = 4.
  • 3. 3- Sketch the circle (x + 4)2 + (y − 5)2 = 36 -We have a circle with centre at (-4, 5) and the radius is r = √36 = 6.
  • 4. 4. Find the equation of the circle with centre (3/2, -2) and radius 5/2. -Centre (3/2, -2) radius 5/2
  • 5. 5- Find the points of intersection of the circle x2 + y2 − x − 3y = 0 with the line y = x − 1. -We solve the 2 equations simultaneously by substituting the expression y = x -1 into the expression We have:
  • 6. So we see that the solutions for x are x = 1 or x = 2. This gives the corresponding y-vales of y = 0 and y = 1. So the points of intersection are at: (1, 0) and (2, 1). We can see that our answer is correct in a sketch of the situation: