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(x+2)(x-2) = 1/2 . (x+2) . t
(x-2)2 = t
2x-4 = t
b. L segitiga = 1/2×a×t
t = = 2x - 4
t = (2.3) - 4 = 6 - 4 = 2 cm
maaf kalu salah