Geometry Help Please?

May 25, 2009 by admin · 2 Comments
Filed under: Mathematics 
construction tools
amyloveschelo8 asked:

Which regular polygon can be drawn by using rotations in Geometer’s Sketchpad?
11-gon

12-gon

13-gon

14-gon

What is the angle of rotation for a point on a circle for drawing a regular 15-gon?______ degrees

What is the angle of rotation for a point on a circle for drawing an equilateral triangle?_______ degrees

What tool can be used in a formal geometric construction?
parallel plates

unit cubes

protractor

compass

Which shape is used to mark equal distances in a construction?
point

line

circle

ray

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2 Responses to “Geometry Help Please?”
  1. notthejake says:

    to draw an n-gon using rotations, 360 must be divisible by n

    since 360 / 12 = 30, you can draw a 12-gon using 30-degree rotations (where the 30 degrees will be the exterior angle)

    for a 15-gon, 360 / 15 = 24, so there will be 24 degree rotations (again, the 24-degrees is the exterior angle)

    only a compass can be used in formal geometric construction

    a circle can mark equal distances in a construction

  2. Lou says:

    You go to COVA don’t you? I do, my quiz had these questions.
    1.12-gon
    2. 24
    3. 120
    4. compass
    5. circle
    I got 100% ;)

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