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r = A×B×C/4( A+B+C)
r=6×8×10/4×(6+8+10)
r=480/96
r= 5cm (D)
maklum jika salah, masih kls 6
doakan saya ujian ya!
1/2×(6+8+10)
1/2×24
=12
√12(12-6)(12-8)(12-10)
√12×6×4×2
=576
=√576
=24
24/12
=2
jadi jawabanya 2(b)