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=48:2=24
L=Akar s(s-a)(s-b)(s-c)
= akar 24(24-12)(4)(8)
=akar 9216 = 96
r lingkrn dlm = L/S
= 96/24= 4
b. S= 1/2 (40+26+42)
=108:2=54
L=akar 54(54-40)(54-26)(54-42)
=akar 54(14)(28)(12)
=akar 254016 = 504
r lingkrn dlm = L/S
= 504/54= ...