Equilateral triangles are also equiangular -- that is, all three internal angles are also equal to each other, with measures of 60 degrees each.
See also trigonometry.
... 41.7 km² (16.1 mi²). 37.6 km² (14.5 mi²) of it is land and 4.1 km² (1.6 mi²) of it is water. The total area is 9.81% water. Demographic ...