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L = (10+2√3) (10-2√3)
= 100 - 20√3 + 20√3 - 4√9
= 100 - 12
= 88
=(10 + )(10 - )
=( 10 × )( × 10 )( × )
=100 - + - (4×3)
=100 -12
=88
jadi,luas persegi panjang tersebut adalah 88