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Luas ABC
= 1/2.3a.3a
= 4,5a^2
= x cm^2
Luas KNB = 1/2.2a.2a = 2a^2
Luas KMB = 1/2.a.2a = a^2
Luas KMN
= luas KNB - KMB
= 2a^2 - a^2
= a^2
= 2/9x cm^2