Question

Keliling lingkaran jika di ketahui jari-jari 10,5 cm dan diameter 16 cm

Answer 1

K = 2 π r
   = 2 x (22/7) x 10,5
   = 66

K = π D
   = 3,14 x 16
   = 50,24

Answer 2

K = 2 x n x r
= 2 x 3,14 x 10,5
= 6,28 x 10,5
= 65,94

k = n x d
= 3,14 x 16
= 50,24

semoga membantu ^_^