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L= 1/2 * a*t = 1/2 * 5*12= 30
s= 1/2 keliling lingkaran = 1/2 (5+ 12+13)= 15
jadi L/S = 30 / 15 = 2
jadi lingkaran dalam = 2 cm
lingkaran luar = a*b*c / 4L
= 5*12*13 / 4 * 30
= 780 / 120
= 6,5
jadi lingkaran luar 6,5 cm