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Karena kedua diagonal persegi sama panjang, maka:
AC = BD
15 = 2x + 7
15 - 7 = 2x
2x = 8
x = 8/2
x = 4
b.)
Maka, panjang diagonal adalah AC = 15
Jumlah panjang diagonal = 15+15 = 30 cm
(Sepertinya agak aneh)