[解決済み] CSSやSVGで半円を描く

<svg class="pie">
  <circle cx="115" cy="115" r="110"></circle>
  <path d="M115,115 L115,5 A110,110 1 0,1 225,115 z"></path>
</svg>

.partial-circle {
  position: relative;
  height: 20px;
  width: 100px;
  overflow: hidden;
}
.partial-circle:before {
  content: '';
  position: absolute;
  height: 100px;
  width: 100px;
  border-radius: 50%;
  bottom: 0;
  background: #D08707;
}

<div class="partial-circle"></div>

.partial-circle {
  position: relative;
  width: 100px;
  overflow: hidden;
}
.partial-circle:before {
  content: '';
  position: absolute;
  height: 100px;
  width: 100px;
  border-radius: 50%;
}
.partial-circle.top {
  height: 80px;
}
.partial-circle.bottom {
  height: 20px;
}
.partial-circle.top:before {
  top: 0;
  background: #E19B21;
}
.partial-circle.bottom:before {
  bottom: 0;
  background: #D08707;
}

<div class="partial-circle top"></div>
<div class="partial-circle bottom"></div>