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b) |AB|=√[(-7+3)²+(-1-2)²]=√[(-4)²+(-3)²]=√[16+9]=√25=5
c) |AB|=√[(1+5)²+(-3+9)²]=√[6²+6²]=√[36+36]=√72=6√2
d) |AB|=√[(124-120)²+(203-200)²]=√[4²+3²]=√[16+9]=√25=5