Question

Tolong dong nomer 7,8
beserta caranya ya. pliss dibantu

Answer 1

Kuncinya:
K = 2πr
Maka,

Nomor 7.
K = 176
2πr = 176
2 x 22/7 x r = 176
44/7 x r = 176
r = 176 x 7/44
r = 4 x 7
r = 28 cm

Nomor 8.
K = 188,4
2πr = 188,4
2 x 3.14 x r = 188,4
6,28r = 188,4
r = 188,4 : 6,28
r = 30 cm

Answer 2

No 7
Diameter = 176 x 7/22
              = 56 cm
Jari Jari = 1/2 x 56
            = 28 cm

No 8
Diameter = 176 x 3,14
              = 522,64 cm
Jari Jari = 1/2 x 522,64
            = 276,32 cm