The circumference of a circle varies directly with the radius. A circular pizza with a radius of 3in has a circumference of about 18.84in. Write the equation using direct variation that relates the circumference, C, to the radius, r. What is the circumference, in square inches, of a personal pizza with a radius of 2in?

c=kr

c=12.56in when r=2in

Step-by-step explanation:

Circumference (c) of a circle varies directly with radius(r)

Equation that relates the circumference and radius is

c=kr

Radius=3in

Circumference=18.84in

18.84=k*3

k=18.84/3

k=6.28

Find circumference when radius=2in

c=kr

c=6.28*2

=12.56in

c=12.56in

so far i think you have the right thing going for you just remember soh cah toh

step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse