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Triangle Copy Help

Page history 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 right-click 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 right-click 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 right-click 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 right-click 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 right-click to rename D -> R and F -> S.
Label: Use right-click to make h red, i blue and j green.
 
Decorate: Right-click 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.

 

Home > Construct with GeoGebra -> Compass and Straightedge -> #3 Copy a Triangle -> HELP

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