## InterA.HelpConstructTriangleCopy History

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[]Draw line segment by clicking twice in drawing pad.

[]Draw base of angle by clicking twice in drawing pad.

[c]

[]Draw top of angle by clicking once on first point A and then above the base.

[]Point C
`b=Segment[A,C]`

[row]

**Decorate:**Right-click on segment, choose properties, color tab: red, style tab: thickness=5. Click on Close.

[c]

[]Draw angle marker by clicking on points B, A and C.

[]`Angle α=Angle[B, A, C]`

[row]

[ colspan=3]

**Decorate:**Right-click on angle, choose "Properties", basic tab: Show Label=Name, style tab: size=50. Click on Close.

[row]

[]Draw line by clicking twice in drawing pad.

[]Point C

Point D
`b=Line[C,D]`

[]Draw line segment by clicking twice in drawing pad.

[]Point D

Point E
`c=Line[D,E]`

[ colspan=3]**Label:** Use right-click to rename C -> P and to hide point D.

[ colspan=3]**Label:** Use right-click to rename D -> P and to hide point E.

[ colspan=3]Copy the segment.

[ colspan=3]Copy the angle.

[]Draw circle with radius the segment and center P by clicking on points A, B and then P.

[]`Circle c=Circle[P, Segment[A, B]`

[]Draw circle with radius the base of the angle and center P by clicking on points A, B and P.

[]`Circle d=Circle[P, Segment[A, B]`

[]Draw point C by clicking on 2nd intersection point of circle and line.

[]Draw point D by clicking on 2nd intersection point of circle and line.

[c]

[]Draw line segment by clicking on points P and C.

[]`d=Segment[P,C]`

[c]

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

[]`Circle e=Circle[P, Segment[A, C]`

[ colspan=3]**Label:** Use right-click to hide/show labels on segment.

**Decorate:**Right-click on new segment, choose "Segment d", choose "Properties", color tab: red, style tab: thickness=5. Don't close. Click on "Circle c", style tab: line style=dotted. Click on Close.

[c]

[]Draw circle with radius the segment BC and center P by clicking on points B, C and E.

[]`Circle f=Circle[E, Segment[B, C]`

[ colspan=3]Check construction.

[c]

[]Draw point F by clicking on top intersection point of circles e and f.

[]`F=Intersect[e, f, 1]`

.

[c]

[]Draw new angle base segment by clicking on points P and E.

[]`g=Segment[P,E]`

[c]

[]Draw new angle top segment by clicking on points P and F.

[]`h=Segment[P,F]`

[] Up one level