The least angle at which the figure may be rotated to coincide with itself is the angle of symmetry.
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the line of symmetry from the middle
What is the angle of rotation of alphabet S
Assuming that you are talking about an equilateral triangle, it has three lines of symmetry. They bisect each angle.
1 its from the "right angle point" on a diagonal to the center of the longest line.None normally but if it's an isosceles right angle triangle it will have 1 line of symmetry.
The angle of rotation for a regular polygon with 7 sides isImmersive Reader