<svg width="150px" height="150px" viewBox="0 0 150 150">
<g style="stroke: black; fill: none;">
<!-- single line -->
<path d="M 10 10 L 100 10"/>
<!-- a right angle -->
<path d="M 10, 20 L 100, 20 L 100,50"/>
<!-- two thirty-degree angles -->
<path d="M 40 60 L 10, 60 L 40 42.68
M 60, 60 L 90 60 L 60, 42.68"/>
</g>
</svg>