<div class="shape"></div>
<div class="shape"></div>

:nth-child(1 of .shape) {
  clip-path: shape(from 0 0,
    arc to 100% 100% of 100% cw,
    line to 0 100%)
}
:nth-child(2 of .shape) {
  clip-path: shape(from 0 0,
    curve to 100% 100% with 100% 0,
    line to 0 100%)
}


.shape {
  width: 200px;
  aspect-ratio: 1;
  display: inline-block;
  background: red;
  margin: 10px;
}