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x² + x² = 16
2x² = 16
x² = 8
luas = 1/2 . a . t
= 1/2 . x . x
= 1/2 . x²
= 1/2 . 8
= 4
x+x=16
2x=16
x =16\2
x=8
luas=½x axt
L=½ x 8 x 8
L=4x8
L= 32