The diameter of circle a is 8 cm, which is 40% of the diameter of circle B______ Cm

The diameter of circle a is 8 cm, which is 40% of the diameter of circle B______ Cm

8 △ 40% = 20 (CM) 3.14 × 20 = 62.8 (CM) a: the circumference of circle B is 62.8 cm, so the answer is: 62.8