Question

a circular fountain has a radius of 9.4 feet. find its diameter and circumference to the nearest tenth.

Answer 1

Diameter is just twice the radius and circumference is 2$\pi$r or $\pi$d
C = 2$\pi$r
C = 2$\pi$(9.4)
C = 18.8$\pi$
C = 59.1
D = 18.8ft

C = 59 if you use 3.14 instead of pi

Answer 2

Diameter is 2r, or 18.8 ft

Circumference is 2*pi*r, or 59.1 ft