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aku lupa jawabannya
s = 1/2 (7 + 24 + 25)
s = 28 cm
L^2 = s((s-a)(s-b)(s-c)
L^2 = 28((28-7)(28-24)(28-25))
L^2 = 28( 21 x 4 x 3)
L^2 = 7056
L = 84
r = a x b x c / (4L)
r = 7 x 24 x 25/ 4 x 84
r = 4200/ 336
r = 12,5 cm
jadi jawaban adalah D. 12,5 cm