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              [[[https://codepen.io/thebabydino/pen/zEbVPO]]]

- var f = .7;
- d *= f , fs *= f, ad *=f, sw *=f, pr *= f, pr1 *= f, pr2 *= f;

svg(viewBox=[-d, -.5*d, 2*d, d].join(' ') 
		xmlns='http://www.w3.org/2000/svg')
	style
		| svg {	fill: #{darken}; font: #{fs}px consolas, monaco, monospace }
		| svg > [d], [r] { fill: none; stroke: #{darken}; stroke-width: #{2*sw} }
		| [y] + [d]:not([d*=z]) { marker-end: url(#e) }
		| [d] + * { font: #{fs}px times new roman, serif }
		| [d] ~ * { font-style: italic }
		| [d] + [d] ~ [y] { fill: #{tomato} }
		| [r='#{hr}'] { stroke: #{llight} }
		| [d][d*=z] { stroke: #{purple}; stroke-width: #{3*sw} }
		| [d] + [d] { stroke: #{orange}; stroke-width: #{4*sw} }
		| [r]:not([r='#{hr}']) { fill: #{orange} }
		| tspan { font-size: .5em }
	marker#e(markerWidth=ad markerHeight=ad 
						viewBox='0 -4 8 8' 
						orient='auto' refX='7')
		path(d='M8 0 0-4V4')
	//-helper circles
	circle(cx=-hrd r=hr)
	circle(cx=hrd r=hr)
	//-radius text
	text(x=+(-.5*(hrd + fs)).toFixed(e) y=-(.5*hrd + .2*fs)) R
	text(x=+(.5*(hrd - .2*fs)).toFixed(e) y=-(.5*hrd + .2*fs)) R
	text(x=+(-.5*(hrd + fs)).toFixed(e) y=(.5*hrd + .8*fs)) R
	text(x=+(.5*(hrd - .2*fs)).toFixed(e) y=(.5*hrd + .8*fs)) R
	text(y=-(hrd + .4*fs)) (0,-R/√2)
	text(y=(hrd + .8*fs)) (0,R/√2)
	text(y=-.2*fs) (0,0)
	text(x=hrd + .4*fs y=fs) (R/√2,0)
	text(x=-(hrd + 5*fs) + .4*fs y=fs) (-R/√2,0)
	//-axes
	path(d=`M${-ax} 0H${ax}`)
	text(x=+(ax - .5*fs).toFixed(e) y=+(-.5*fs).toFixed(e)) x
	path(d=`M0${-f*ax}V${f*ax}`)
	text(x=.4*fs y=(f*ax - .2*fs)) y
	//-radius lines
	path(d=`M${-hrd} 0 0${-hrd} ${hrd} 0 0 ${hrd}z`)
	//-segment connecting circle central & intersection points
	path(d=`M${-hrd} 0H${hrd}M0${-hrd}V${hrd}`)
	//-highlighted points
	circle(cx=-hrd r=pr1.toFixed(e))
	circle(cx=hrd r=pr1.toFixed(e))
	circle(cy=-hrd r=pr.toFixed(e))
	circle(cy=hrd r=pr1.toFixed(e))
	circle(r=pr2.toFixed(2))
	//-point names
	text(x=+(-.7*fs).toFixed(e) y=-(hrd + .4*fs)) T
	text(x=+(-.7*fs).toFixed(e) y=(-.2*fs)) O
	text(x=hrd - .4*fs y=fs) O<tspan>0</tspan>
	text(x=-(hrd + 5.4*fs) y=fs) O<tspan>1</tspan>
	text(x=+(-.7*fs).toFixed(e) y=(hrd + .8*fs)) S

// minimal SVG
<svg viewBox='-1750 -875 3500 1750' xmlns='http://www.w3.org/2000/svg'><style>svg{fill:#333;font:105px consolas,monaco,monospace}svg>[d],[r]{fill:none;stroke:#333;stroke-width:7}[y]+[d]:not([d*=z]){marker-end:url(#e)}[d]+*{font:105px times new roman,serif}[d]~*{font-style:italic}[d]+[d]~[y]{fill:#b53}[r='625']{stroke:#ccc}[d][d*=z]{stroke:#95a;stroke-width:10}[d]+[d]{stroke:#f90;stroke-width:14}[r]:not([r='625']){fill:#f90}tspan{font-size:.5em}</style><marker id='e' markerWidth='7' markerHeight='7' viewBox='0 -4 8 8' orient='auto' refX='7'><path d='M8 0 0-4V4'/></marker><circle cx='-442' r='625'/><circle cx='442' r='625'/><text x='-274' y='-242'>R</text><text x='211' y='-242'>R</text><text x='-274' y='305'>R</text><text x='211' y='305'>R</text><text y='-484'>(0,-R/√2)</text><text y='526'>(0,R/√2)</text><text y='-21'>(0,0)</text><text x='484' y='105'>(R/√2,0)</text><text x='-925' y='105'>(-R/√2,0)</text><path d='M-1230 0H1230'/><text x='1178' y='-53'>x</text><path d='M0-861V861'/><text x='42' y='840'>y</text><path d='M-442 0 0-442 442 0 0 442z'/><path d='M-442 0H442M0-442V442'/><circle cx='-442' r='13'/><circle cx='442' r='13'/><circle cy='-442' r='18'/><circle cy='442' r='13'/><circle r='9'/><text x='-74' y='-484'>T</text><text x='-74' y='-21'>O</text><text x='400' y='105'>O<tspan>0</tspan></text><text x='-1009' y='105'>O<tspan>1</tspan></text><text x='-74' y='526'>S</text></svg>
            
          
!
            
              body {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	margin: 0;
	height: 100vh;
}

svg { display: block }
            
          
!
            
              // minimal SVG: https://codepen.io/thebabydino/pen/OxdaaB?editors=1000
            
          
!
999px
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