It is 360 degrees divided by the order of rotational symmetry.
A square.
Its to say its the MEASURE of the angle, instead of the angle itself
An obtuse angle.
add 15 to it
You don't rotate the angle, you rotate an object by that angle, for example if you had to rotate something 180o it would flip over.
A square.
If you can rotate (or turn) a figure around a center point by fewer than 360° and the figure appears unchanged, then the figure has rotation symmetry. The point around which you rotate is called the center of rotation, and the smallest angle you need to turn is called the angle of rotation. This figure has rotation symmetry of 72°, and the center of rotation is the center of the figure:
The least angle at which the figure may be rotated to coincide with itself is the angle of symmetry.
Its to say its the MEASURE of the angle, instead of the angle itself
add 15 to it
An obtuse angle.
go off
You don't rotate the angle, you rotate an object by that angle, for example if you had to rotate something 180o it would flip over.
Take any one point on the figure. Draw a line from it to the origin. At the origin measure an angle of 90 degrees (right angle) in a clockwise direction. Draw a line from the origin at this new angle and of the same length as the original angle. Repeat this process for the other points in the figure. NB Be careful, there will be numerous lines from the origin. At the end points of the new lines, connect up to reveal the origin figure ,but rotated 90 degrees - clockwise.
A straight angle
Just Measure it
64º 136º 144º 54º