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d = 20 cm
K = π d
K = 3.14 x 20
= 62,8
a. 60° = (60/360) x 62,8
= 10,466 cm
b. 90°= (90/360) x 62,8
=15,7 cm
c. 120° = (120/360) x 62,8
= 20,933 cm
d. 180° = (180/360) x 62,8
=31,4 cm