4 ms·This is also true of a triangle, and indeed there are triangular manholes.by jpindar 9y agoThis is also true of a triangle, and indeed there are triangular manholes.sobani 9y agoAren't the altitudes/heights of a triangle shorter than its sides? The height of an equilateral triangle is about 87% of the length of one of its sides.jpindar 9y agoTrue. Whether they fit through the hole depends on how thick they are.