hitunglah keliling lingkaran dengan diameter d= 7 cm d = 21 cm d= 8 d = 10

k dgn d=7 cm
k = [tex] \pi d = \frac{22}{7} . 7 = 22 cm [/tex]

k dgn d=21 cm
[tex]k = \pi d = \frac{22}{7} . 21 = 22 . 3 = 66 cm[/tex]

k dgn d=8
[tex]k = \pi d = \frac{314}{100} . 8 = \frac{314 . 8}{100} = \frac{2512}{100} = 25,12 [/tex]

k dgn d=10 cm
[tex]k = \pi d = \frac{314}{100}.10 = \frac{314}{10} = 31,4 [/tex]

yang d=10 cm pakai phi = 3,14 biar 10 nya bisa dibagi

semoga membantu