180 degrees
A Full rotation
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order of rotation of semicircle is 1. angle of rotation of semicircle is 360 degree. If you want to find angle of rotation of a shape, then divide 360 from order of rotation of a shape.
The order of rotational symetry can be 0, 2, 3 or 6. The first one gives no degree of rotation. The others are, respectively, 180, 120 and 60 degrees.
Short answer: 72 degrees Longer answer: To rotate a star until it looks the same you need to make 1/5 of a complete 360 degree turn (since a star has 5 points). Sice 1/5 X 360 = 72, the answer is 72 degree angle rotation.
A 90 degree rotation is a quarter of a turn.
The original rotation of the original star
A degree is a measure of rotation, with 360 degrees representing a complete rotation returning to the starting point.
180 degrees
A Full rotation
A 180 degree rotation between front and back is normal for US coins.
Answer: 130 degrees. 360x4=1440 degrees. So each time we have 360 degree rotation, we end up where we started. The rotation will be 1575-1440=130 degrees.
Rotation preserves shape - therefore the angle before the rotation equals the angle after the rotation.
The effect of the rotation is the same as that of a 90 degree clockwise rotation. In matrix notation, it is equivalent to [post-]multiplication by the 2x2 matrix: { 0 1 } {-1 0 }
A Full rotation
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