proving lines parallel
Move the slider so that line g and line h are parallel.
How do you know that the two lines will be parallel?
Move the slider so that lines g and h become parallel.
How do you know that lines g and h are parallel?
Move the slider so that lines f and h become parallel.
How do you know that lines f and h are parallel?
Move the slider so that lines f and h become parallel.
How do know that lines f and h will be parallel?