Detailed explanation of the border-radius attribute of CSS style

<p></p>

 p {
    height: 200px;
    width: 200px;
    border: 2px solid #a72525;
    border-radius: 10px;
}

 p {
    height: 200px;
    width: 200px;
    background: #a72525;
    border-radius: 50%;
}

 p {
    height: 200px;
    width: 100px;
    border: 2px dashed #a72525;
    border-radius: 100px 0 0 100px;
}

 p {
    height: 200px;
    width: 200px;
    border: 2px dotted #a72525;
    border-radius: 100% 0 0;
}

 p {
    height: 200px;
    width: 100px;
    background: #f09;
    border-radius: 50%;
}

 p {
    height: 200px;
    width: 200px;
    background: #f90;
    border-radius: 100% 0;
}

 p {
    width: 0;
    height: 0;
    border: 100px solid gray;
    border-radius: 100px;
    border-right-color: transparent;
}