.triangle{width:0;height:0;border-width:50px;border-style:solid;border-color:red blue green yellow;}
.triangle_top{width:0;height: 0;border-width:50px;border-style:solid;border-color:red transparent transparent transparent;}
.triangle_right{width:0;height: 0;border-width:50px;border-style:solid;border-color:transparent blue transparent transparent;}
.triangle_bottom{width:0;height: 0;border-width:50px;border-style:solid;border-color:transparent transparent green transparent;}
.triangle_left{width:0;height: 0;border-width:50px;border-style:solid;border-color:transparent transparent transparent yellow;}

<style>
.pie38{width: 100px;height: 100px;border-radius: 50px;margin:20px;background-color: #ddd;position: relative;display: inline-block;overflow: hidden}
.pie38 .pie_content{line-height: 100px;text-align: center;position: absolute;width: 100px;height: 100px;z-index: 8}
.pie38 .pie_left{position: absolute;top:0;left:0;width: 50px;height: 100px;overflow: hidden;}
.pie38 .pie_left:after{content: '';height: 100px;width:50px;border-right:50px solid red;position:absolute;top:0;left:0;transform: rotate(-137deg);}
</style>
<div class="pie38">
 <div class="pie_content">38%</div>
 <div class="pie_left"></div>
</div>

<style>
.pie88{width: 100px;height: 100px;border-radius: 50px;margin:20px;background-color: #ddd;position: relative;display: inline-block;overflow: hidden;}
.pie88 .pie_content{line-height: 100px;text-align: center;position: absolute;width: 100px;height: 100px;z-index: 8}
.pie88 .pie_left{position: absolute;top:0;left:0;width: 50px;height: 100px;overflow: hidden;background-color: red}
.pie88 .pie_right{position: absolute;top:0;right:0;width: 50px;height: 100px;overflow: hidden;}
.pie88 .pie_right:after{content: '';height: 100px;width:50px;border-left:50px solid red;position:absolute;right:0;top:0;border-radius: 50px;transform: rotate(-137deg);}
</style>

<div class="pie88">
 <div class="pie_content">88%</div>
 <div class="pie_left"></div>
 <div class="pie_right"></div>
</div>