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Triangle Copy Help

Page history last edited by LFS 14 years, 3 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.