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1/2× 6×6= 6
s = 1/2 x (6 + 8 + 10) = 12
L = √(s(s - a)(s - b)(s - c))
= √(12(12 - 6)(12 - 8)(12 - 10))
= √(12(6)(4)(2)
= 24
r = abc/4L
= (6 x 8 x 10)/ (4 x 24)
= 5 cm