hitung jari jari lingkaran jika diketahui kelilingnya sebagai berikut: a.176 cm. b.628 cm. c.157 cm. d.1256 cm.

A)
K = 176
2xphixr = 176
2×22/7xr = 176
44/7 x r = 176
r = 176 : 44/7
r = 176 x 7/44
r = 28 cm

b)
K = 628
2xphixr = 628
2×3,14xr = 628
6,28 x r = 628
r = 628 : 6,28
r = 100 cm

c)
K = 157
2xphixr = 157
2×3,14xr = 157
6,28 x r = 157
r = 157 : 6,28
r = 25 cm

d)
K = 1256
2xphixr = 1256
2×3,14xr = 1256
6,28 x r = 1256
r = 1256 : 6,28
r = 200 cm

A. K = 2 π r
   176 = 2 x 22/7 x r
   176 = 44/7 x r
   176 x 7 = 44 r
   1232 = 44 r
      r  = 1232 ÷ 44 = 28 cm
b. 628 = 2 x 3,14 x r
    628 = 6,28 x r
    r = 628 ÷ 6,28 = 100 cm
c. 157 = 2 x 3,14 x r
    157 = 6,28 x r
     r = 157 ÷ 6,28 = 25 cm
d. 1256 = 2 x 3,14 x r
    1256 = 6,28 r
       r = 1256 ÷ 6,28 = 200 cm

Semoga Membantu 🙂