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                <svg viewBox='-13 -7 34 17' 
	<marker id='a' viewBox='-8 -4 8 8' 
					markerWidth='5' markerHeight='5' 
					orient='auto' refX='-7'>
		<path d='M-8 0 0-4V4'/>
	<marker id='a1' viewBox='0 -4 8 8' 
					markerWidth='5' markerHeight='5' 
					refX='7' orient='auto'>
		<path d='M8 0 0-4V4'/>
	<!-- guides -->
	<path d='M13-6H0V9
					 M0 0h11M0-2h9M0-3h7M0-4h9M0 6h13M0 3h8
					 M-6 0V9M-3 3V7M6 0V9M3 3V7'/>
	<!-- the big circle -->
	<circle r='6'/>
	<!-- smaller (inner) circles -->
	<g id='c'>
		<circle r='3' cy='3'/>
		<circle r='1' cy='3'/>
	<use xlink:href='#c' y='-6'/>
	<path d='M0 6
					 A6 6 0 0 1 0-6
					 A3 3 0 0 1 0 0
					 A3 3 0 0 0 0 6'/>
	<!-- small marker circles -->
	<g id='q'>
		<g id='p'>
			<circle r='.1' cy='2'/>
			<circle r='.1'/>
		<use xlink:href='#p' y='4'/>
		<circle r='.1' cy='3'/>
	<use xlink:href='#q' y='-6'/>
	<circle r='.1' cx='-6'/>
	<circle r='.1' cx='6'/>
	<circle r='.1' cx='-3' cy='3'/>
	<circle r='.1' cx='3' cy='3'/>
	<!-- meas lines & text -->
	<g id='m'>
		<path d='M8-6v2'/>
		<text x='8.2' y='-4.8'>r/3</text>
	<use xlink:href='#m' y='2'/>
	<use xlink:href='#m' y='4'/>
	<g id='m1'>
		<path d='M10.5 0v6'/>
		<text x='10.7' y='3.25'>r</text>
	<use xlink:href='#m1' y='-6'/>
	<g id='m3'>
		<path d='M-6 8.5h6'/>
		<text x='-3.15' y='9.3'>r</text>
		<g id='m2'>
			<path d='M-6 6.5h3'/>
			<text x='-5.15' y='7.3'>r/2</text>
		<use xlink:href='#m2' x='3'/>
	<use xlink:href='#m3' x='6'/>
	<g id='m4'>
		<path d='M7 0v3'/>
		<text x='7.3' y='1.7'>r/2</text>
	<use xlink:href='#m4' y='3'/>
		<path d='M6.5-2v1m0-3v1'/>
		<text x='5.8' y='-2.3'>r/6</text>
		<path d='M12.5-6V6'/>
		<text x='13' y='.25'>d = 2·r</text>
		<text x='9' y='8'>r = d/2</text>
	<!-- diameter end points -->
	<text y='-6.2'>A</text>
	<text y='5.8'>B</text>


                svg {
	stroke: #444;
	stroke-width: .08px;
	fill: none;
	font: .65px consolas

[r='6'] { stroke: #9351a6 }
[r='3'] { stroke: #d49b00 }
[r='1'] { stroke: #e18728 }
[r*='.1'] { fill: #bbb }

#a1 + * {
	stroke: #bbb;
	stroke-width: .05px

[d*=A] { stroke: #be4c39 }

g {
	marker-start: url(#a);
	marker-end: url(#a1)

[id*=a] *, text {
	stroke: none;
	fill: #444

g ~ text {
	font: italic .65px tahoma;
	fill: #be4c39