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10x^2 = 90
x^2 = 9
berarti x = 3
pnjng persegi = 2/3 . (5 . 3)
= 10
jadi, luas = 10 . 10= 100 cm pangkat 2
smg membantu
10a^2 = 90^2
10a = 90
a = 9
panjang persegi panjang = 5a=45
sisi persegi= 2/3*45 = 30
Lpersegi = 30^2 = 900
semoga membantu ya.... :)