GEOMETRY

radius and circumference and diameter

100

The diameter of a circle is 8. what is the radius?

4

200

Find the radius of a circle with circumference 16(pie)

8

300

the diameter of a circle is 7.5. Find the circumference to the nearest tneth

23.6

400

Find the diameter and radius of a circle with a circumference of 40 in. round to the nearest hundredth

Diameter=12.7 Radius=6.35

500

Find the diameter and the radius of a circle with a circumference of 79.5 yd

diameter=25.31 radius=12.66

Equations of Circles

100

Write an equation for the circle with a center at (2,-4) and radius of 8

(x-2)²+(y+4)²=8²

200

write the equation of a circle with a center at (-2,3) and radius of 5

(x+2)²+(y-3)²=5²

300

Find center and radius of (x+10)²+(y+9)²= 8

center=(-10,-9), radius=2.75

400

find the center and radius of x²+(y+20)²=121

center= (0,-2) radius=11

500

write an equation for a circle with a center at origin and diameter 4

x²+y²=4²

Dilations

100

dilation of 4.5 coordinates, (-1,0), (-1,1), (1,0)

(-4.5,0), (-4.5,4.5), (4.5,0)

200

dilation of 3/2 coordinates, (-2,2), (-2,3), (2,0), (1,-2)

(-3,3), (-3,4.5), (3,0), (1.5,-3)

300

dilation of .25 coordinates (2,-1), (4,4), (4,-1)

(.5,-.25), (1,1), (1,-.25)

400

dilation of 1.5 coordinates (-1,0), (-1.5,1.5), (3,0)

(-1.5,0), (-1.5,1.5), (3,0)

500

dilation of 3 coordinates (2,1), (-3,-4), (5,2), (1,1)

(6,3), (-9,-12), (15,6), (3,3)