Algebra

posted by .

A roof rises 2.3 feet vertically, and 7.4 feet horizontally. What is the grade of the roof?

I do not understand how to even find what the grade would be..can anyone help?

  • Algebra -

    Ever heard of google? wikipedia?
    You may have a calculator which allows you to switch among radians, degrees, and "grad" units. Guess what grads are? The grade.

    On a highway you may see a sign near a steep hill, saying steep grade ahead: 6%.

    The gradient is measured in vertical/horizontal, as a percent.

    So, a 6% grade is one where the elevation changes 6' for every 100' of lateral distance.

    So, a 100% grade is a 45° angle, because there is a rise of 1 unit for every horizontal unit.

    Now, for your problem:

    2.3/7.4 = 0.31 = 31% grade

  • For Steve - Algebra -

    The Grad on a calculator has nothing to do with the grade of a roof
    The grade of a roof is simply the slope, which you found correctly.

    In the DRG on a calcuator, the G stands for gradians, which was an attempt to make angles fit into the metric system.
    A right angle is defined as 100 gradians.

    you can test this by
    setting your calcualtor to D and taking tan 45°
    now set your calculator to G and take tan 50
    you will get the same result.

    Btw, I have yet to come across anybody who uses gradians in any calculation these days. They should be dropped from calclators.

  • Algebra -

    cool. my bad

  • Algebra -

    In fact, i think I knew that, but got caught up in the heat of the explanation. :-(

  • Algebra -

    what is the number whose distance is 5 to the left of 12

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. MAT116-Algebra 1A math

    A roof rises 1.9 feet vertically and 5.9 feet horizontally. What si the grade of the roof?
  2. math

    a roof rises 1.2 feet vertically and 5.9 feet horizontally. What is the grade of the roof?
  3. Math

    a roof rises 1.9 feet vertically and 9.1 feet horizonally. what is the grade of the roof?
  4. math

    a roof rises 1.1 feet vertically and 13.6ft horizontally what is the grade of the roof.
  5. math

    a roof is 2.5 feet vertically and 12.3 feet horizontally. what is the grade of the roof?
  6. mat 116

    a roof rises 1.9 feet vertically and 7 feet horizontally. what is the grade of the roof?
  7. algebra

    A roof rises 1.4 feet vertically and 11.8 feet horizontally. What is the grade of the roof?
  8. algebra

    a roof rises 1.3 feet vertically and 13.1 feet horizontally. wgat is the grade of the roof?
  9. Algebra

    a roof rises 2.4 feet vertically and 7.3 feet horizontally. what is the grade of the roof?
  10. physics

    A roof rises 1.7 feet vertically and 13.3 feet horizontally. What is the grade of the roof in percentage

More Similar Questions