Semoga yg jawab menjadi orang yg baik hati , ku follow, jawabin semuanya y ​

1). a. K = π × d = 22/7 × 28 = 88 cm

b. K = π × d = 3,14 × 30 = 94,2 cm

c. K = 2 × π × r = 2 × 22/7 × 10,5 = 66 cm

d. K = 2 × π × r = 2 × 3,14 × 25 = 157 cm

2). a. K = π × d = 3,14 × 24 = 75,36 cm

b. K = π × d = 22/7 × 35 = 110 cm

c. K = 2 × π × r = 2 × 3,14 × 15 = 94,2 cm

d. K = 2 × π × r = 2 × 22/7 × 21 = 132 cm

3).

a. K = π × d

94,2 = 3,14 × d

d = 94,2 / 3,14

d = 30 cm

b. K = π × d

55 = 22/7 × d

d = 55 / 22/7

d = 55 × 7/22

d = 17,5 cm

c. K = π × d

50,25 = 3,14 × d

d = 50,25 / 3,14

d = 16 cm

d. K = π × d

132 = 22/7 × d

d = 132 / 22/7

d = 132 × 7/22

d = 42 cm