COMPARING SEGMENTS

comparing slopes

Parallel

• If two segments have the same slope, they are parallel
• If their slope are not the same, the segments are not parallel

Perpendicular

• If the slopes of two segments are opposite reciprocals, they are perpendicular
• This means the product of the slopes is -1
• The segments form right angle(s)

Neither

• If the slopes are not equal and...
• the slopes are not negative reciprocals...
• then the lines intersect at angles but not right angles

Comparing Lengths

• When asked to compare lengths look for ratios
• You are not looking at differences in lengths but...
• rather at their proportion
• For example, is one segment two times as long as another?

Dilations

• dilations will produce parallel sides...
• and proportional sides