Find the diameter, the radius, and the length of an arc of 140? 8. The circumference of a circle is 60 cm. Find the diameter, the radius, and the length of an arc of 140°. a. 120 cm; 30 cm; 160 cm b. 30 cm; 60 cm; 11.7 cm c. 60 cm; 30 cm; 23.3 cm d. 60 cm; 120 cm; 11.7 cm 9. A team in science class placed a chalk mark on the side of a wheel and rolled the wheel in a... show more