Geometry Pad-2D: Working with triangle [1]

Suppose that we have some problem like: "Given triangle ABC with the height AH, draw line HD // AC, D is on side AC...."

pic 1

With the "Geometry Pad-2D" app, you can draw the picture easily by following steps:

Step 1: Draw triangle ABC

Step 1: Draw triangle ABC

a) Tap on the "+" tool of the TOP toolsbox
b) Tap on the "triangle" tool of the RIGHT toolsbox
c) Select type of triangle
d) Move triangle into right position 

Note: You also can change the drawn triangle by tap on any vertex or side then move it, change it using points or line segments tools

Step 2: Draw height AH

There are different ways to draw the heights of triangle: use points tools, use lines tools or use triangle tools. The following shows how to use points tools to draw height AH.

a) Select vertex A
b) Select "draw perpendicular segment" tool
c) Select showed point to draw line to...

Note: new the point on BC is automatically named as "D", we will change name of the point later.

Step 2: Draw height from A

Step 3: Draw line segment parallel to  AB

a) Select line AB, then select point D
b) Select "draw perpendicular..." of the Right toolsbox
c) Tap on small brown circle appeared on AC

Step 3: Draw DE // AB

Note: by default, new added line segments have "dotted" style









Step 4: Naming, styles and colours

a) Now you can use points tools (select any point to show point tools on the right side of screen) to change name(s) of points. In our case change "D" -> "H" and "E" -> "D"

(The naming tool is the first one of the points toolsbox)

b) Select line segment to show lines toolsbox on the right side of screen. Use change line-style, change line-colour tools to make a picture look as you want

line segments toolsbox

c) Select angle AHC and mark it with, the right angle mark will be drawn

mark angle

Free download

2014.11.10
Geometry 2D-Pad on Facebook