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diagonal 1 = diagonal 2
6x - 2 = 2x + 10
6x - 2x = 10 + 2
4x = 12
x = 12 / 4
x = 3
panjang diagonalnya :
6x - 2
= 6(3) - 2
= 18 - 2
= 16 cm
6x-2x=10+2
4x=12
x=3
6x-2 = 6(3)-2 =18-2 = 16
jadi,diagonal persegi panjang 16 cm
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