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= 11
L =
=
=
=
= 2√110
dengan s = 1/2 keliling
a = sisi a
b = sisi b
c = sisi c
maka,
s = 1/2 x (9+7+6)
= 1/2 x 22
= 11
luas = √11 (11-9) (11-7) (11-6)
luas = √11(2)(4)(5)
luas = √11(40)
luas = √440
luas = √2² x 2 x 5 x 11
luas = 2 √2x5x11
luas = 2 √110