No, a triangle can only be equilateral if all of its angles = 60 degrees and 60 degrees is acute, not obtuse.
An obtuse triangle is more than 90 degrease and a right triangle is exactly 90 degrease. An acute triangle is less than 90 degrease.
An octagonal pyramid has eight triangles on an octagonal base. An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and...
Three is to triangle as eight is to octagon.
the one with equal sides the whole way around. they also have equal angles too.