Jawaban:

1. r = 100 cm

2. L = 7.850 cm²

3. 40 kali putaran

4. r = 14 cm

Penjelasan dengan langkah-langkah:

1. Diketahui

Kll = 628 cm

Ditanya r = ?

Jawab

Kll = π x d

628 = 22/7 x d

d = 628/22/7

d = 628 x 7/22

d = 4396/22

d = 199,8 = 200 cm

r = d/2 = 200/2

r = 100 cm

2. Diketahui

Kll = 3,14 cm

Ditanya L =. ?

Jawab

Kll = π x d

314 = 3,14 x d

d = 314/3,14

d = 314 : 314/100

d = 314 x 100/314

d = 31.400 / 314

d = 100 cm

r = d/ 2 = 100/2 = 50 cm

L = π x r x r

= 3,14 x 50 x 50

= 7.850 cm²

3. Diketahui

r = 50 cm

d = 125,6 m = 12.560 cm

Ditanya banyaknya putaran

Jawab

Kll = 2 x π x r

kll = 2 x 3,14 x 50

Kll = 314 cm

d = Kll x putaran

putaran = d / kll

putaran =12.560/314

putaran = 40 kali

4. Diketahui

L = 616 cm²

Ditanya r = ?

Jawab

L = π x r x r

L = π x r²

616 = 22/7 x r²

r² = 616 : 22/7

r² = 616 x 7/22

r² = 4312/22

r² = 196

r = √196

r = 14 cm

Semoga membantu dan tidak keliru