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(x,y)--sym. OX -->(x,-y) a) A1(1,4) B1(5,1) |AB|=|A1B1|=[(5-1)^2+(1-4)^]^1/2=[16+9]^1/2=25^1/2=5 |BB1|=|A1A|=[(-1-1)^2]^1/2=2 L=2*(2+5)=14 b) A1(3,-6) B1(-2,-1) AB|=|A1B1|=[(-2-3)^2+(-1+6)^2]^1/2=[50]^1/2=5sqrt2 |BB1|=|A1A|=[(1+1)^2]^1/2=2 L=2*(2+5sqrt2) c) A1(-2,1) B1(4,4) AB|=|A1B1|=[(4+2)^2+(4-1)^2]^1/2=[36+9]^1/2=[45]^1/2=3sqrt5 |BB1|=|A1A|=[(4+4)^2]^1/2=8 L=2*(8+3sqrt5)
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