Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.


7 Answers

  • Anonymous
    1 month ago

    Make a 70 degree angle and have a good look at it.

  • 1 month ago

    (1) On your paper, draw a horizontal straight line OA.

    (2) Use a protractor, with O as the vertex, to

    mark down an angle <AOB=70* in the clockwise direction; then the angle <AOB=

    290* ,in the counterclockwise direction.

  • Pope
    Lv 7
    1 month ago

    A 290° angle cannot be constructed within the classical straightedge and compass rules.

    Are you familiar with the ancient angle trisection construction challenge? It was never solved, but it was eventually proved that no general solution is possible. The only proof with which I am personally familiar was one in which it was proved that construction of a 20° angle is impossible. A 60° angle is quite a simple construction. Since a 20° construction is impossible, it must be impossible to trisect a 60° angle, and therefore angle trisection is not generally possible.

    That result applies directly to your question. A 270° construction is simply a matter of perpendicular lines, an elementary construction. If it were possible to construct 290°, then that angle could be combined with a 270° angle to form a 20° angle. However, once again, that is not possible. Therefore, the 290° construction cannot be possible.

  • ?
    Lv 7
    1 month ago

    1) 290° is in the 4th quadrant (lower right quadrant below the +x axis)

    2) The reference angle for 290° is 360 - 290 = 70°

    3) Draw a line from the origin at an angle of 70° below the +x axis in the 4th quadrant

    4) The angle from the +x axis counter clockwise around to the terminal line you just drew in step 3) measures 290°

  • How do you think about the answers? You can sign in to vote the answer.
  • 1 month ago

    290 degrees has the same construction as 360 - 290 = 70 degrees.  If this is for a physical object, look up the tangent ratio for 70 degrees.  That's about 2.75, by the way.  So you draw a line (say) 1 foot long, and a line at right angles to that 2.75 feet long, making the 2 legs of a right triangle.  Draw the hypotenuse, and the angle adjacent to the 1-foot side will be 70 (290) degrees.

    Or use a protractor, or computer drawing program, to get 70 degrees.

  • Tasm
    Lv 6
    1 month ago

    With an angle ruler. You don't need to reinvent the wheel. 

  • 1 month ago


Still have questions? Get your answers by asking now.