1、斜边在左边三角形
<style>
.triangle {
border-top: 50px solid transparent;
border-bottom: 50px solid transparent;
border-left: 50px solid #000;
width:0;
height:0;
}
</style>
<div class="triangle"></div>
2、斜边在上面的三角形
<style>
.triangle {
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 50px solid #000;
width:0;
height:0;
}
</style>
<div class="triangle"></div>
3、斜边在下边的三角形
<style>
.triangle {
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 50px solid #000;
width:0;
height:0;
}
</style>
<div class="triangle"></div>
4、斜边在右边的三角形
<style>
.triangle {
border-top: 50px solid transparent;
border-bottom: 50px solid transparent;
border-right: 50px solid #000;
width:0;
height:0;
}
</style>
<div class="triangle"></div>
5、等边三角形(等边三角形的底边的高是底边的1/sqrt(2)倍)
<style>
.triangle {
border-left: 40px solid transparent;
border-right: 40px solid transparent;
border-bottom: 28px solid #000;
width:0;
height:0;
}
</style>
<div class="triangle"></div>