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a = t
a² + t² = 16²
2a² = 256
a² = 256/2 = 128
a = 8√2
t = a = 8√2
maka luas 1/2 x 8√2 x 8√2 = 1/2 x 128cm²
= 64 cm²
256=2a²
a² =256/2
a² =128
a. =√128
L= axt/2=√128x√128/2= 128/2=64 cm²