can right angle triangle be equilateral
Short Answer: no <br /><br /> Long Answer: <br /> Most people consider Euclidean Geometry when taking about standard shapes such as triangles and squares. <br /><br /> In Euclidean Geometry: all equilateral triangles have angles of 60Â°. Therefore an equilateral triangle doesn't have a right angle. <br /><br /> However, in Non-Euclidean Geometry (Elliptic Geometry) a triangle can have all angles at 90Â°. Consider going for a walk at the North Pole.