Path Arc

<svg viewBox="0 0 300 150" xmlns="http://www.w3.org/2000/svg">

    <path d="M 100 100 L 100 50 A 50 50 0 0 1 143.3 125 Z" 
                fill="lightblue" 
                stroke="black" 
                stroke-width="2"/>

    <path d="M 100 100 L 100 50" 
                fill="lightblue" 
                stroke="red" 
                stroke-width="2"/>

</svg>