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b. 64-16= 48cm^2
tuh jawabannya
(x2-16)= 1/2. x-4. t
t = x+4
x=8,
alas= x-4
= 8-4
= 4
tinggi = x+4
= 8+4
= 12
luas= 1/2(x-4)(x+4)
= 1/2 (x2-16)
= 1/2 (64-16)
= 1/2 (48)
=24