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Forum: Construction Questions

Post specific constructions questions in this forum.

  1. Sticky Thread Sticky: Forum for construction questions

    If you have a how-to question, please post to the Construction Questions forum. You can attach sketches to your post. Happy sketching! ...

    Started by Elizabeth DeCarli, 05-31-2011 05:56 PM
    • Replies: 0
    • Views: 3,380
    05-31-2011 05:56 PM Go to last post
  1. How can I construct an ellipse given one focus and two points on the ellipse?

    I created the attached sketch to answer your question. Here is a snapshot from the sketch that I'll refer to in my explanation below. (Click on image...

    Started by Andres, 07-23-2012 05:20 PM
    • Replies: 0
    • Views: 5,247
    07-23-2012 05:20 PM Go to last post
  2. How do I construct an arc sector of a circle (a slice of pizza shape)

    Dear Sketchers, I want to use the area of a sector equation, so I need to be able to construct a polygon from a central angle of the circle that...

    Started by Robwinfield, 07-22-2012 12:08 PM
    • Replies: 2
    • Views: 5,866
    07-22-2012 07:12 PM Go to last post
  3. Working with functions and parameters

    I've been trying to teach myself how to use Sketchpad & going to the Tuesday webinars, but I'm stuck and need a bit of help. I've used the getting...

    Started by mratzel, 07-08-2012 07:53 AM
    • Replies: 1
    • Views: 3,061
    07-09-2012 11:21 AM Go to last post
  4. Counter

    I use this activity with my students on the first day of school to get them thinking after a long summer break. The goal is for them to state that...

    Started by jgrebe, 07-05-2012 03:04 PM
    • Replies: 2
    • Views: 3,462
    07-06-2012 07:13 PM Go to last post
  5. Question How to teach addition and subtraction of like and unlike fractions using GSP?

    I saw one 'Make fraction' tool on this community which could construct any fraction and resemble it in a circle. Thinking on the same grounds I am...

    Started by Vicky_1984, 07-04-2012 01:04 AM
    • Replies: 1
    • Views: 6,948
    07-05-2012 12:48 PM Go to last post
  6. How do I make angles that are not even multiples of 360 such as 60, 30 and exact leng

    How do I make an angle that is π3 or π6, for example? Bisect is an option but trisect is not. Also, is there a way to type in the measurement one...

    Started by Robwinfield, 06-12-2012 08:13 AM
    • Replies: 3
    • Views: 3,772
    07-01-2012 06:24 AM Go to last post
  7. Constructing an accurate tangent line along the exterior of a circle

    I am using Geometer's Sketchpad version 5.04 and I wanted to illustrate the the law that: 1. If a secant segment and a tangent segment to the...

    Started by Robwinfield, 06-08-2012 01:37 PM
    • Replies: 9
    • Views: 18,094
    06-20-2012 05:12 AM Go to last post
  8. Making objects disappear.

    How do you make a part of a constructed line disappear while keeping a segment of it?

    Started by luis, 06-12-2012 09:37 AM
    • Replies: 1
    • Views: 2,745
    06-12-2012 10:38 AM Go to last post
  9. Displaying Slopes and Other Values as Fractions

    I recently received a tech-support question that asked ----------- Is there a way to get sketchpad to display the slope of a line or segment in...

    Started by Stek, 06-12-2012 10:23 AM
    • Replies: 0
    • Views: 4,496
    06-12-2012 10:23 AM Go to last post
  10. Layering colors

    I'm having students create a US flag (parallel lines, stars, the works). How do I get it so when the star is layered onto the blue field, that the...

    Started by Mr H, 05-24-2012 07:57 PM
    • Replies: 1
    • Views: 2,715
    05-25-2012 09:19 PM Go to last post
  11. Question How can a Square root spiral be constructed using GSP?

    We need to rotate a point by 90 degrees keeping a distance fixed. Imagine we have a triangle DBC where BC is base and DB is perpendicular. <DBC is 90...

    Started by Vicky_1984, 05-08-2012 12:17 AM
    • Replies: 4
    • Views: 7,483
    05-09-2012 06:57 AM Go to last post
  12. 3D rectangle construction

    How do you construct a 3D rectangle which can be modified by dragging the vertices but still maintain being a rectangle, be allowed to see the...

    Started by Brett Mulvey, 05-03-2012 09:03 AM
    • Replies: 1
    • Views: 3,622
    05-06-2012 07:49 PM Go to last post
  13. Coincident Points Construction Problem

    An online course participant had a question about a rhombus construction that failed the drag test. The failure occurred because vertex C was a point...

    Started by Stek, 05-03-2012 12:32 AM
    coincident points, construction problem, drag test, rhombus
    • Replies: 0
    • Views: 2,570
    05-03-2012 12:32 AM Go to last post
  14. Lock point to area

    How can I lock a point to the area of a polygon (say a triangle). I can lock it to the perimeter, but what about the area. Or, another option--in...

    Started by bnussbaum, 04-17-2012 11:46 AM
    • Replies: 3
    • Views: 4,281
    05-01-2012 09:13 AM Go to last post
  15. Reset Buttons?

    Hi All, I have created a Transformation activity for my students. Currently the only way I know to reset their work from class to class is to make...

    Started by OldManMath, 03-22-2012 05:38 AM
    reset, save changes, transformations
    • Replies: 2
    • Views: 3,968
    04-30-2012 07:42 PM Go to last post
  16. Measurements in Graph Units

    I had a question recently about making measurements in graph units: length measurements of segments and arcs, radii of circles and arcs, and...

    Started by Stek, 04-12-2012 03:22 PM
    arcs, circles, graph units, measurements
    • Replies: 0
    • Views: 3,706
    04-12-2012 03:22 PM Go to last post
  17. The Big Picture - Dynamic Measurement - Skewing squares

    Nick Jackiw in his series of videos of "The Big Picture" included within the "Dynamic Measurement" clip a presentation of the Euclidean proof that...

    Started by topcat, 04-09-2012 02:00 PM
    • Replies: 2
    • Views: 2,823
    04-09-2012 06:18 PM Go to last post
  18. Play Video or Audio from your Sketch

    I've just posted an example of playing video and audio from a sketch, using Link buttons. Link buttons are very flexible. In addition to taking...

    Started by Stek, 03-27-2012 07:41 PM
    audio, link buttons, media, video
    • Replies: 0
    • Views: 2,772
    03-27-2012 07:41 PM Go to last post
  19. Graphing Hyperbolas and Ellipses

    A user recently asked how to graph a hyperbola. Because hyperbolas and ellipses cannot be expressed explicitly as functions, they must be graphed as...

    Started by Stek, 03-27-2012 07:17 PM
    • Replies: 0
    • Views: 5,873
    03-27-2012 07:17 PM Go to last post
  20. Constructing an Annulus

    A participant in an online course just wrote me to ask how to construct an annulus (the region between two concentric circles). She tried...

    Started by Stek, 03-12-2012 05:45 AM
    circle annulus locus
    • Replies: 0
    • Views: 4,153
    03-12-2012 05:45 AM Go to last post

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