Question

Help me: A circle has a diameter of 140 cm.

Work out the circumference of the circle.
Give your answer correct to 3 significant figures.

Answer 1

Circumference =diameter * pi number

140*3.14= 439.6

Answer 2

440cm (to 3 s.f.)

Explanation:

circumference= πd

= π×140

= 440cm (to 3 s.f.)