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2x=8
x=4
#
b.f(4)=2(2x+7)
=2(2.4+7)
=2.15
=30 cm
15 - 7 = 2x + 7 - 7
8 = 2x
x = 8 : 2
x = 4 cm
b. Jumlah panjang diagonal = AC + BD = 15 + 15 = 30 cm