Folium de descartes tiene la ecuacion x^3+y^3-3axy=0 con la sustitucion de y=mx, de las ecuaciones x=3am/m^3+1 , y=3am^2/m^3+1

can i know which language is this?

arc length = radius * x ( in radians)

6 * pi = 18 * x

divide by 18 on each side

6 pi / 18 = x

pi/3 = x

the angle is pi / 3 radians

or   60 degrees

example answer: "to determine if a sum is reasonable you can round each number to the nearest whole and compare the estimated sum to the actual sum."

hope this you and anyone else who needs the answer : ^)