Difference between revisions of "User:Jonjoseph"
| Line 181: | Line 181: | ||
label("$\tan \theta$", (1,.375), E); | label("$\tan \theta$", (1,.375), E); | ||
label("$\sec\theta$", (.5, .375), NW); | label("$\sec\theta$", (.5, .375), NW); | ||
| + | </asy> | ||
| + | |||
| + | <asy> | ||
| + | size(200); | ||
| + | import three; | ||
| + | currentprojection = orthographic(3.1, 2.1, 1); | ||
| + | triple A, B, X, Y, Z; | ||
| + | A = (1, 1, 0); | ||
| + | B = (0, 0, 1); | ||
| + | O = (0,0,0); | ||
| + | X = (1, 0, 0); | ||
| + | Y = (0, 1, 0); | ||
| + | Z = (0, 0, 1); | ||
| + | |||
| + | real big = 2; | ||
| + | |||
| + | draw(surface(-(big - 0.1)*X - (big - 0.1)*Y -- -(big - 0.1)*X + (big - 0.1)*Y -- (big - 0.1)*X + (big - 0.1)*Y -- (big - 0.1)*X - (big - 0.1)*Y--cycle), rgb(226, 253, 255), nolight); | ||
| + | draw(O--big*X, Arrow3(size = 0.2cm)); | ||
| + | draw(O-- -big*X, Arrow3(size = 0.2cm)); | ||
| + | draw(O-- big*Y, Arrow3(size = 0.2cm)); | ||
| + | draw(O-- -big*Y, Arrow3(size = 0.2cm)); | ||
| + | draw(O-- big*Z, Arrow3(size = 0.2cm)); | ||
| + | draw(O-- -big*Z, Arrow3(size = 0.2cm)); | ||
| + | |||
| + | label("$x$", big*X, NW); | ||
| + | label("$y$", big*Y, N); | ||
| + | label("$z$", big*Z, W); | ||
| + | |||
| + | draw(A--B, red, Arrow3(size = 0.3cm)); | ||
| + | |||
| + | dot("$A$", A, S); | ||
| + | dot("$B$", B, E); | ||
</asy> | </asy> | ||
Revision as of 10:49, 12 September 2020
![[asy] pair O = (0,0); pair P = (2,0); draw(unitcircle); dot(O); dot(P); label('$P$', P, E); label('$C$', O, W); [/asy]](http://latex.artofproblemsolving.com/f/8/c/f8c42e0581ece077163a0525688493127ba20734.png)
Given a circle with center 
and a point 
that lies outside the circle, bisect circle with a second circle centered at .
![[asy] pair O = (0,0); pair P = (2,0); pair A = (0,1); pair B = (0, -1); draw(unitcircle); draw(A--B, red); draw(P--O, red); draw(circle(P, 2.24)); dot(O); dot(P); dot(A); dot(B); label('$P$', P, E); label('$C$', O, W); [/asy]](http://latex.artofproblemsolving.com/e/b/4/eb4535e9b70c84a691a32b89d485892fe6de6140.png)
Problem from class:
![[asy] import olympiad; import cse5; import geometry; size(150); defaultpen(fontsize(10pt)); defaultpen(0.8); dotfactor=4; pair X = origin; pair Y = (3,0); pair W = X+dir(120); pair Z = Y+dir(120); pair T = (0,2); pair S = T+dir(120); pair U = (3,2); pair V = U+dir(120); label("$X$",X,SW); label("$W$",W,SW); label("$T$",T,NE); label("$S$",S,NW); label("$Z$",Z,E); label("$Y$",Y,SE); label("$U$",U,E); label("$V$",V,NE); draw(X--Y); draw(Z--Y, dashed); draw(W--X, red); draw(X--Z, red); draw(Z--U, red); draw(Z--W,red); draw(U--X, red); draw(S--T--U--V--cycle); draw(X--T); draw(W--S); draw(Y--U); draw(Z--V,dashed); draw(W--U,red); [/asy]](http://latex.artofproblemsolving.com/d/3/d/d3da50bbda0e54e8877f454374bdab7022ed1881.png)
![[asy] unitsize(1 cm); pair A, B, C; A = (0, 0); B = (2, 0); C = (2, 1.5); draw(A--B--C--cycle); label("$A$", A, W); label("$B$", B, E); label("$C$", C, N); label("$5$", (A+B)/2, S); label("$6$", (B+C)/2, E); label("$\theta$", A, NE); [/asy]](http://latex.artofproblemsolving.com/0/0/5/0055b5424b85dba13127410913120a01d3710e1a.png)
![[asy] unitsize(0.2 cm); pair A, B, E, P; A = (0,0); B = (8,0); E=(1,2); P = (B + reflect(A,(1,2))*(B))/2; draw((-10,0)--(10,0)); draw(A+(-1,-2)--8*E, red); draw(A--(0,25)); draw(B+-1*(1,2)--(9, 2)+7*(1,2), red); draw(B--P,dashed); dot("$A$", A, SE); dot("$B$", B, SE); dot("$P$", P, N); label("$8$", (A + B)/2, S); [/asy]](http://latex.artofproblemsolving.com/d/2/0/d20de7cc152e261b3e6ac322e36b265c71fa8902.png)
![[asy] size(125); real ticklen=3; real tickspace=2; real ticklength=0.1cm; real axisarrowsize=0.14cm; pen axispen=black+1.3bp; real vectorarrowsize=0.2cm; real tickdown=-0.5; real tickdownlength=-0.15inch; real tickdownbase=0.3; real wholetickdown=tickdown; void rr_cartesian_axes(real xleft, real xright, real ybottom, real ytop, real xstep=1, real ystep=1, bool useticks=false, bool complexplane=false, bool usegrid=true) { import graph; real i; if(complexplane) { label("$\textnormal{Re}$",(xright,0),SE); label("$\textnormal{Im}$",(0,ytop),NW); } else { label("$x$",(xright+0.4,-0.5)); label("$y$",(-0.5,ytop+0.2)); } ylimits(ybottom,ytop); xlimits( xleft, xright); real[] TicksArrx,TicksArry; for(i=xleft+xstep; i<xright; i+=xstep) { if(abs(i) >0.1) { TicksArrx.push(i); } } for(i=ybottom+ystep; i<ytop; i+=ystep) { if(abs(i) >0.1) { TicksArry.push(i); } } if(usegrid) { xaxis(BottomTop(extend=false), Ticks("%", TicksArrx ,pTick=gray(0.72),extend=true),p=invisible);//,above=true); yaxis(LeftRight(extend=false),Ticks("%", TicksArry ,pTick=gray(0.72),extend=true), p=invisible);//,Arrows); } if(useticks) { xequals(0, ymin=ybottom, ymax=ytop, p=axispen, Ticks("%",TicksArry , pTick=black+0.8bp,Size=ticklength), above=true, Arrows(size=axisarrowsize)); yequals(0, xmin=xleft, xmax=xright, p=axispen, Ticks("%",TicksArrx , pTick=black+0.8bp,Size=ticklength), above=true, Arrows(size=axisarrowsize)); } else { xequals(0, ymin=ybottom, ymax=ytop, p=axispen, above=true, Arrows(size=axisarrowsize)); yequals(0, xmin=xleft, xmax=xright, p=axispen, above=true, Arrows(size=axisarrowsize)); } }; rr_cartesian_axes(-5,5,-1,10); real f(real x) {return x*x;} real g(real x) {return 2*x*x;} draw(graph(f,-sqrt(10),sqrt(10),operator ..), red ,Arrows(size=axisarrowsize)); draw(graph(g,-sqrt(5),sqrt(5),operator ..), blue ,Arrows(size=axisarrowsize)); //dot((2,4), p=orange); //dot((2,8),p=orange); //draw((2,4)--(sqrt(2),4),p=orange, Arrow(size=2*axisarrowsize)); draw((3,9)--(3/sqrt(2),9),p=black, Arrow(size=2*axisarrowsize)); dot((3, 9), p=black); //dot((-1,1), p=purple); //dot((-1,2),p=purple); //draw((-1,1)--(-1,2),p=purple, Arrow(size=2*axisarrowsize)); [/asy]](http://latex.artofproblemsolving.com/0/d/b/0dbdc91e07c89e6b538c8bef097c05a08e2c843b.png)
![[asy] size(170); draw(circle((0,0),1)); draw((0,0)--(1,0)--(1,.75)--cycle); draw((0.9,0)--(0.9,0.1)--(1,0.1)); label("$\theta$", (0.15,0), NE); label("1", (0.5,0), S); label("$\tan \theta$", (1,.375), E); label("$\sec\theta$", (.5, .375), NW); [/asy]](http://latex.artofproblemsolving.com/8/1/7/817dd81f35edbf2abd6a11d1fa0ed4b94b12ab1e.png)
![[asy] size(200); import three; currentprojection = orthographic(3.1, 2.1, 1); triple A, B, X, Y, Z; A = (1, 1, 0); B = (0, 0, 1); O = (0,0,0); X = (1, 0, 0); Y = (0, 1, 0); Z = (0, 0, 1); real big = 2; draw(surface(-(big - 0.1)*X - (big - 0.1)*Y -- -(big - 0.1)*X + (big - 0.1)*Y -- (big - 0.1)*X + (big - 0.1)*Y -- (big - 0.1)*X - (big - 0.1)*Y--cycle), rgb(226, 253, 255), nolight); draw(O--big*X, Arrow3(size = 0.2cm)); draw(O-- -big*X, Arrow3(size = 0.2cm)); draw(O-- big*Y, Arrow3(size = 0.2cm)); draw(O-- -big*Y, Arrow3(size = 0.2cm)); draw(O-- big*Z, Arrow3(size = 0.2cm)); draw(O-- -big*Z, Arrow3(size = 0.2cm)); label("$x$", big*X, NW); label("$y$", big*Y, N); label("$z$", big*Z, W); draw(A--B, red, Arrow3(size = 0.3cm)); dot("$A$", A, S); dot("$B$", B, E); [/asy]](http://latex.artofproblemsolving.com/7/7/b/77bf07f9b9c99eee9e7ae0fbc9bcd88c87fab999.png)
