How do you figure out the number?
Is there a simple math equation to figure this out?
code: https://jsfiddle.net/wayd0xg4/
.one {
border-radius: 22.5%;
}
.two {
border-radius: 50px;
}
<img class="one" src="https://via.placeholder.com/230x230">
<img class="two" src="https://via.placeholder.com/230x230">