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4 = 84/S
S = 84/4
S = 21 cm
S=1/2( 13+14+c)
21 = 1/2 (13+14+c)
21x2 = 27+c
42 = 27+c
c = 42-27
c = 15 cm
pjg jari2 lingkaran luar=
r = axbxc/4L
r = 13x14x15/4x84
r =2730/336
r= 8,125 cm