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绘制扇形

  1. 先绘制三角形
  2. 设置圆角为 100%
<div class="snip"></div>

<style>
  .snip {
    width: 0px;
    height: 0px;
    border-top: 50px solid black;
    border-right: 50px solid transparent;
    border-bottom: 50px solid transparent;
    border-left: 50px solid transparent;
    border-radius: 100%;
  }
</style>