Abicycle wheel has a diameter of 21 inches. what is the circumference of this wheel? what is the radius

C = 65.97 in; r = 10.5 in

Step-by-step explanation:

The circumference is C = πd.  Since the diameter is 21 in, the circumference is C = (3.14)(21 in) = 65.97 inches.

The radius is half the diameter:  

r = (21 in) / 2 = 10.5 in

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80