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John Stith Pemberton
Answer this question… half
180 degrees, if you mean a half circle
A straight angle is a half circle.
It is the consequence of one of the circle theorems and in some books, it is considered a theorem itself. The underlying proposition is that the angle subtended at the circumference of the circle by any arc of a circle is half the angle subtended at the centre. In the case of a semicircle, the arc is the half circle and the angle at the centre is the one that the diameter makes at the centre of the circle ie 180 degrees. So the angle at the circumference is half that ie 90 degrees.
A semi-circle, half a circle, by definition is 180 degrees, half of a rotation. A whole circle has a whole rotation, which is 360 degrees.
180 degrees.
Half of a revolution of a circle is 180 degrees and its angles added together are supplementary.
In a circle, the measure of an inscribed angle is indeed half the measure of the intercepted arc. This means that if you have an angle formed by two chords that intersect on the circle, the angle's measure will be equal to half the degree measure of the arc that lies between the two points where the chords meet the circle. This relationship is a fundamental property of circles in Euclidean geometry.
A protractor can be used to measure an angle. An angle is basically part of a circle. A complete circle is 360 degrees. A right-angle is 90 degrees, half a circle is 180 degrees, and so on.
180o is basically a straight angle, if 360 was a circle 180 wiuld be a half circle