Tentukan jari jari dan diameter lingkaran yang kelilingnya,sebagai berikut

Jawaban :

A.) K = 2πr

77 = 2 × 22/7 × r

77 × 7 = 2 × 22 × r

539 = 44r

539/4 = r

12,25 cm = r

d = 2r

= 2. 12,25

= 24,5 cm

B.) K = 2πr

141,3 = 2 × 3,14 × r

141,3 = 6,28r

141,3/6,28 = r

22,5 cm = r

d = 2r

= 2. 22,5

= 45 cm

C.) K = 2πr

69,08 = 2. 3,14. r

69,08 = 6,28r

69,08/6,28 = r

11 cm = r

d = 2r

= 11.2

= 22 cm

D.) K = 2πr

198 = 2. 22/7. r

198.7 = 2.22.r

1386 = 44r

1386/44 = r

31,5 cm = r

d = 2r

= 2. 31,5

= 63 cm

semoga bermanfaat