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Q: Half a circle plus circle plus half a circle plus a half a circle plus circle plus 90' angle plus a guess wat it is?

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John Stith Pemberton

Answer this question… half

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.

180 degrees, if you mean a half circle

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.

A straight angle is a half circle.

180 degrees.

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.

A half angle is just what it sound like; it's half the measure of an angle. If you have an angle of 30 degrees, the half angle is 15 degrees. Simple and easy. Where it comes in handy is in construction of something like, say, an isosceles triangle inside a circle. If you have the two equal equal angles, you can find the third angle. Then you can construct it by drawing a chord across the circle through its diameter, then using the half angle to draw in one side. Repeating the process on the other side of the diameter will give you the other side of the triangle. By drawing in a chord connecting the points where the other two chords (drawn off the half angles on either side of the diameter) intersect the circle, you'll have completed the construction of the isosceles triangle.

another name for a half circle is semi-circle

It is an angle that divides a right angle in half. It measures an eighth of a circle or pi/4 radians.

Half of a revolution of a circle is 180 degrees and its angles added together are supplementary.

180o is basically a straight angle, if 360 was a circle 180 wiuld be a half circle

half of the radius the radius is half of the diameter the diameter is the with of the circle. This also can be called a quadrent circle.

Half a circle is called a semi-circle. Sometimes it is called a half-moon.

a half circle? a half? semi circle? half sphere?

semicircleA half circle is called a semicircle.Half a circle is a semi-circle

no... a straight line is a 180 degrees half circle.

Half a circle is called a "semicircle" in geometry.

Half a circle is called a SEMI-CIRCLE

To bisect an angle is to divide the angle in half.

A half circle is called a semicircle.

The radius is half of the diameter of a circle.

Another name for half a circle is a semicircle.