The correct answer is the option D, which is: <span>D. 78 cm; 39 cm; 30.3π cm The explanation is shown above: 1-The formula for calculate the circumference of a circle is: C=2</span>πr 78π=2πr 2- The radius is: r=78π/2π r=39 cm 3- The diameter is: D=39 cm x 2 D=78 cm 4- The arc length is: arc length=(140°π/180°)(39 cm) arc length=30.3π cm
