Certain animals have their body parts arranged around a central point. A starfish is a good example of this, which is known as radial symmetry.
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Animals with radial symmetry have body parts arranged around a central point. Any line drawn from one side through the center to the opposite side will divide the animal into two symmetrical halves.
It is 60 degrees
termed the oral, or anterior, end, and the other of which, called the aboral, or posterior, end, forms the rear end of the animal and may bear the anus. The main axis is hence termed the oral-aboral, or anteroposterior, axis. Except in animals having an odd number of parts arranged in circular fashion (as in the five-armed starfishes), any plane passing through this axis will divide Or basically if you want to look at it, oral means cutting the organism horizontally and aboral means cutting the organism vertically.
That is part of a psychology knownas "gestalt psychology", first promoted around 1900 by Christian von Ehrenfels. Its premise is that "the whole is greater than the sum of its parts"
A circular sector is formed by two radii and an arc. And the angle formed due to the two radii is central angle(Θ). Area of a sector = (Θ/360) πr2.If we divide a circle into seven sectors having equal central angles then the circle is divided into seven equal parts.Angle of the whole circle is 360o. So we should divide the whole angle into 7 equal parts each measuring 360o/7 and then forming the corresponding sectors.