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Circles and Ovals DO have lines of symmetry: a circle has an infinite number of them (each is a diameter of the circle) and an oval (ellipse) has two (one along the major axis, one along the minor axis). Shapes which have no lines of symmetry are irregular ones, eg scalene triangles, along with most parallelograms (ie parallelograms which are not rhombuses) and non-isosceles trapezia. Some irregular shapes can have lines of symmetry, eg irregular octagons can have 1, 2 or 4 lines of symmetry as well as no lines of symmetry, unlike a regular octagon which [always] has 8 lines of symmetry.
The G major scale contains 1 sharp: the note F#. The scale of a piece of music is usually indicated by a key signature, a symbol that flattens or sharpens specific lines or spaces on the staff.
The major disadvantages of the standard addition calibration method are that: 1) More time consuming 2) More laborious 3) Slightly more intense mathematical exercise required to obtain your final results
January was extended to 31 days 2055 years ago, in 44 BC. That was just a small part of a major calendar reform undertaken by Julius Caesar, the final product being the Julian calendar.