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b= 5
(A)
r =
1 cm =
1 cm =
12 : 1 cm = 7 cm + c
12 cm = 7 cm +c
12cm - 7 cm = c
rumus menentukan jari-jari lingkaran luar
r =
r =
r =
r = 2,5 cm
jadi jari-jari lingkaran luar segitiga yaitu 2,5 cm (A)