Multiplying Complex Numbers
Find Center and Radius
Midpoint
Write the Equation of the Circle
Miscellaneous
100

(3i)(−2 + 6i)

−18 − 6i

100

(x-2)2+(y-2)2=4

Center: 2, 2

Radius: 2

100

Endpoints: (-2, -2) & (2, 2)

0, 0

100

8x + x2− 2y = 64 − y2

(x+4)2+(y-1)2=81

100

(x − 2)2+ (y + 1)2= 16

Center:  2, -1

Radius: 4

200

(6i)(−4i)

24

200

(x+5)2+(y-17)2=36

Center:  -5, 17

Radius: 6

200

Endpoints: (-4, 2) & (2, 2)

-1, 2

200

x2+ y2+ 14x − 12y + 4 = 0

(x+7)2+(y-6)2= 81

200

Write the equation for a Circle:

Center: (−11, −8)

Radius: 4

(x+11)2+(y+8)2=16

300

(5 − 3i)(−8 + 5i)

−25 + 49i

300

(x-4)2+(y+6)2= √27

Center:  4, -6

Radius: 27

300

Endpoints: (-4, -1) & (5, 3)

1/2, 1

300

Center: (−6, −15)

Radius: √5

(x+6)2+(y+15)2=5

300

Find the midpoint from the endpoints:

(−3.1, −2.8) & (−4.92, −3.3)

−4.01, −3.05

400

(−5 + 4i)(−2 + 2i)

2 − 18i

400

x2+ (y − 3)2= 14

Center:  0, 3

Radius: √14

400

Endpoints: (4.9, −1.3) & (−5.2, −0.6)

−0.15, −0.95

400

(x − 16)2+ (y − 6)2= 1

Translated 4 left, 2 up

(x-12)2+(y-8)2=1

400

Find the Center and Radius:

9 = 2y − y2− 6x − x2

Center: (-3, 1)

Radius: 1

500

5(−i)(−4 + 6i)

30 + 20i

500

x2+y2=9/4 

Center:  0, 0

Radius: 3/2

500

Endpoints: (5.1, 5.71) & (6, 3.6)

5.55, 4.655

500

(x + 5)2+ (y + 7)2= 36

Translated 5 left, 4 down

(x+10)2+(y+11)2=36

500

Find the point that is one-fourth of the way

from (2, 4) to (10, 8).

(4, 5)

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