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Triangle Copy Help
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last edited
by LFS 10 years, 7 months ago
Home > Construct with GeoGebra > Compass and Straightedge > #3 Copy a Triangle > HELP
Do the givens. 

Draw base of triangle by clicking twice in drawing pad. 
Point A
Point B
a=Segment[A,B]


Draw right side of triangle by clicking once on first point B and then above the base. 
Point C
b=Segment[B,C]


Draw left side of triangle by clicking once on first point C and then on point A. 
Point C
c=Segment[C,A]

Label: Use rightclick to make a red, b blue and c green. 

Draw line segment by clicking twice in drawing pad. 
Point D
Point E
d=Line[D,E]

Label: Use rightclick to rename D > P and to hide point E (if desired). 
Copy the base. 

Draw circle with radius the base of the triangle and center P by clicking on points A, B and P. 
Circle e=Circle[P, Segment[A, B] 
Label: Use rightclick to make circle e red. 

Draw point D by clicking on 2nd intersection point of circle and line. 
D=Intersect[e, d, 2]. 

Draw circle f with radius the top of the angle and center P by clicking on points A, C and P. 
Circle f=Circle[P, Segment[A, C] 

Draw circle g with radius the segment BC and center P by clicking on points B, C and E. 
Circle g=Circle[E, Segment[B, C] 
Label: Use rightclick to make circles f blue and g green. 

Draw point F by clicking on top intersection point of circles f and g. 
F=Intersect[f,g, 1]. 

Draw new triangle base segment by clicking on points P and E. 
h=Segment[P,E] 

Draw new triangle right side by clicking on points D and F. 
i=Segment[D,F] 

Draw new triangle left side by clicking on points P and F. 
j=Segment[P,F] 
Label: Use rightclick to rename D > R and F > S. 
Label: Use rightclick to make h red, i blue and j green. 
Decorate: Rightclick on any circle, choose "Properties", style tab: line style=dotted.
In left pane of Properties window, select other circles and repeat: line style=dotted.
In left pane of Properties window, select line c and change: line style=dashed.
Click on Close.

Check construction. 

Click and drag vertices of triangle ABC to change its size. 
Copied triangle should match changes. 
Save construction. Command: File > Save. 
geometric, construct, construction, straightedge, compass, ruler, geogebra, application, geometry, program
Triangle Copy Help

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