Monday, March 10, 2014

How to start drawing a geometry construction

Imagine your construction

Before starting drawing, it is important to think about the construction: which is the main object? (a triangle? a square? a trapezoid? or a circle?...) and where to start?... Try to imagine your construction and choose the object to start.

Add the first object(s)
P1: Basic objects tools

The drawing screen starts with the basic objects tools. Choose your object, drag into the drawing area and drop it! The most common object to start are triangle, line and circle.

After adding the first object, you can add the second,...

Note: basic objects tools add an object independently of other objects on your constructions. If you want to add an object with some relation with existing object (for example: draw line from a selected point to other point), choose points tools, line tools,... in accordance with your selected object.
P2: connecting points

Draw line connecting a selected point with other point

The picture P2 shows a simple construction with line segment BC and point A. Touch on point A to select it. Now you can use line drawing tool (the first one on the left of toolset) of points toolset to draw line from point A to any other point.

Touch and hold the line tool, drag it into drawing area (do not drop it) and you can see 5 green circles appeared with the pink one connecting to A by a dotted red line (P3).

1) Green circles are points A, B, C, projected point of A on BC and the midpoint of BC.

2) The pink circle is pointer of current position, drag and drop it on the point you want to connect with point A.

P3



For example, we do the following:

- connect A with B (draw line AB)
- connect A with C (draw line AC)
- connect A with midpoint of BC (draw the median AM)
- name the midpoint of BC as M

Finally we have a triangle ABC with the median AM.

Note: when you drag nearly to the highlighted points, the app with automatically adjust the pointer into it. This helps you draw easier and more exactly. 


11.3.2014

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