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Q: Who invented half circle full circle half circle A half circle full circle right angle A?

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A protractor is a shape: semi-circle or full circle, that has degrees marked around the edge. Place the marked centre of the protractor on (for example) the corner of two lines forming a right-angle. The bottom line will be zero, while the vertical line will cross the 90 degrees mark of the protractor, so proving that a right-angle is 90 degrees.

Because 360 degrees is a full circle. And you can't go any further

No. 360 degrees is a full circle. These two angles, when added together would form a straight line, or 180 degrees.

One tenth of a full circle is 36 degrees.

24 degrees. Here's why: The sum of the deviations from a straight line at the angles must add up to 360 degrees (full circle). In a regular polygon, each deviation is equal. So, in this case, each deviation is 360 / 15 = 24 degrees. Since the exterior angle is the supplement of the interior angle (they add up to 180), this is the exterior angle.

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No, it's 90. A right angle is 25% of a full circle, (or 1/4 of a circle) ......... if a full circle is 360 degrees around, then a right angle, being 1/4 of that, must be 90 degrees.

There are 90o in a right angle. A right angle is one-quarter of a full circle i.e. 360o.

There are 90 degrees in a right angle There are 180 degrees on a straight line There are 360 degrees in a full circle

There are 90o in a right angle. A right angle is one-quarter of a full circle i.e. 360o.

It was the ancient Babylonians and Greeks who classified angles into degrees out of 360 degrees which is full rotation of circle.

no,

The right angle of a right-angle triangle, like all right angles, is 90 degrees or one quarter of 360 (a full circle). All the angles of any triangle will add up to 180 degrees.

No. A full angle is a segment of a line which goes to a vertex and returns along the same path. Any point on the line segment, other than the vertex, will trace out a circle but the angle itself is NOT a circle.

All right angles measure 90 degrees, that is, one-quarter of a full circle. If the angle doesn't measure 90 degrees it isn't a right angle; all right angles are identical.

An angle whose measure is 76/360 of a full circle.

Yes, a full turn is 360o.