Btukfyl

One:

begin{pspicture}[showgrid](-3,-2)(2,2)

psset{PointSymbol=none,CodeFig,CodeFigColor=red}

pstTriangle(1,1){A}(-2,1){C}(-1,-1){B}

pstProjection{A}{B}{C}[I]

pstProjection{A}{C}{B}[J]

pstProjection{C}{B}{A}[K]

end{pspicture}

The result of compiling:

Question: How to modify the size of right angle?

Two: TikZ's code

begin{tikzpicture}

tkzDefPoints{0/0/B,6/0/C,2/4/A}

tkzDrawCircle[circum](A,B,C) tkzGetPoint{O} %% <<----- notice

tkzDrawCircle[in](A,B,C) tkzGetPoint{I} %% <<----- notice

tkzDrawSegments(A,B B,C C,A)

tkzDrawPoints(A,B,C,O,I)

tkzLabelPoints[above](A,I)

tkzLabelPoints[left](B,O)

tkzLabelPoints[right](C)

end{tikzpicture}

The result of compiling:

Question:

How to draw incircle (of the triangle) ABC only use pstCircleABC[Options]{A}{B}{C}{O} ? P/s: I know that we can use pstBissectBAC, pstProjection and pstCircleOA but that is very long .... :-))

Three:

Give the following:

pstLineAB[Options]{A}{B}

pstCircleOA[Options]{O}{A}

pstCircleAB[Options]{O}{A}

pstDistAB[Options]{A}{B}

pstDistVal[Options]{x}

pstInterFF[Options]{f}{g}{x0}{M}

pstInterFL[Options]{f}{A}{B}{x0}{M}

pstInterFC[Options]{f}{O}{A}{x0}{M}

psGetDistanceAB[Options](x1,y1)(x2,y2){<name>}

psGetAngleABC[Options](x1,y1)(x2,y2)(x3,y3){<symbol>}

Question:

Please tell me know possible optional arguments of them. :))

Sorry if I make you being uncomfortable! Warning: Do not delete. :-)))