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= (10 + 2√3 ) (10 - 2√3)
= 100 - 4.3
= 100 -12
= 88 cm²
L= 10-2√3
Luas = P x L
= (10 + 2√3) ( 10 - 2√3)
= 100 + 20√3 - 20√3 - 4√9
= 100 - 12
= 88