anonymous
  • anonymous
in a plane, if two lines are perpendicular to the same line, then they are what to each other.
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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mathteacher1729
  • mathteacher1729
Have you tried drawing a sketch? 1) Draw a line. 2) Make a second line perpendicular (90 degrees) to the first one. 3) Draw another line perpendicular to the very first line. How are lines 2 and 3 related? (parallel, perpendicular, intersecting at 45 degrees, etc?) Hope this helps.
anonymous
  • anonymous
You can also think about slope. if they are mutually perpendicular to a common line of arbitrary slope, how are their slopes related? (perpendicular lines have opposite reciprocal slopes)
anonymous
  • anonymous
they are parallel aren't they

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anonymous
  • anonymous
that's right
anonymous
  • anonymous
if the common line has slope a, the two perpendiculars have slope -1/a. Since their slope is the same they are parallel
anonymous
  • anonymous
what are the exterior angles of a triangle is it 360 degrees

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