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818jasmine

  • 4 years ago

in a plane, if two lines are perpendicular to the same line, then they are what to each other.

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  1. mathteacher1729
    • 4 years ago
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    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.

  2. rsvitale
    • 4 years ago
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    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)

  3. 818jasmine
    • 4 years ago
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    they are parallel aren't they

  4. rsvitale
    • 4 years ago
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    that's right

  5. rsvitale
    • 4 years ago
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    if the common line has slope a, the two perpendiculars have slope -1/a. Since their slope is the same they are parallel

  6. 818jasmine
    • 4 years ago
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    what are the exterior angles of a triangle is it 360 degrees

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