Mathematics, 20.12.2019 18:31 mpateltx

Which undefined term is used to define an angle?

line
plane
point
ray

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Answer from: eshaesmot12345

The Undefined term that is used to define an angle is a point.

Further Explanation: AngleAn angle is defined as the union of two rays with a common endpoint.The common end point is known as the vertex of the angle while the rays are known as the sides of the angle.A ray

It is a part of a line with one end point and proceeds on in one direction.

Naming of anglesAngles can be named in three different ways;Using three Capital letters such as ∠ PQR, or ∠BCD. The middle letter represents the vertex of the angle. Therefore, the angles above are read as "angle PQR" and angle BCD.Using the Vertex of the angle. For example, in the case of ∠PQR, can also be called angle Q, while ∠BCD can be called angle C.Angles can also be named by placing any number or symbol at the vertex in the interior of the angle. Such that angles can be called angle 1 or angle 3 , or angle 5, and so on.Angles are measured using a tool known as a protractorMeasuring of an angle using a protractorTo measure the angle, the mid-point of a protractor is placed on the vertex of the angle. Then lining up one side of the angle with the zero line of the protractor. Then read the degrees where the other side crosses the number scale.

Keywords: Rays, angles, properties of angles, measurement of angles

Learn more about;Angles: Rays: Units used to measure angles: Methods of naming angles: Measuring angles:

Level: Middle school

Subject: Geometry

Topic: Angles

Answer from: tommyaberman

The undefined term is used to define an angle is the $\boxed{{\mathbf{point}}}$ .

Further explanation:

A ray

It is straight line that has one fixed point and can be extended from another point.

The best example of the ray of sunlight as it does not extend from both the points and proceed in one direction.

Angle

An angle can be drawn with the union of two rays that has common endpoint.

The rays are the sides of the angle and the common end point is the vertex of the angles.

The symbol to represent the angle is “ $\angle$ ”.

It can be better explained through an explain as,

$\angle ABC{\text{ and }}\angle PQR$

The middle alphabet always represents the vertex of the angle.

The angle $\angle ABC{\text{ }}$ can also be called as $\angle B$ and $\angle PQR$ can also be called $\angle Q$ .

The angle $\angle ABC$ read as ABC and $\angle PQR$ read as PQR .

The angle is measured with the use of protractor.

Procedure to measure an angle with protractor:

Place the mid point of the protractor on the vertex of the angle.

Placed the protractor in such a way that one side of the angle match with the zero line of the protractor.

Now read the degree as per the required problem.

Thus, the undefined term is used to define an angle is the ${\text{point}}$ .

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Answer details:

Grade: Junior school

Subject: Mathematics

Chapter: Line, rays and angles.

Keywords: Angle, rays, lining, vertex, line, segment, line segment, mid point, degrees, zero line, protractor, scale

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Which undefined term is used to define an angle?

line
plane
point
ray...

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