What is the circumference of a circle with a radius 7.1 cm, to the nearest tenth?
What is the circumference of a circle with a radius 7.1 cm, to the nearest tenth ?
circumference = $$\pi \cdot d \qquad d = 2\cdot 7.1 ~ \rm{cm} = 14.2 ~ \rm{cm}$$
circumference = $$\pi \cdot 14.2 ~ \rm{cm} \approx 44.1 ~ \rm{cm}$$
