Fill in the blank with letter of the word that completes the sentence.
a. congruent
b. rays
c. right
d. degrees
e. three
f. endpoint
g. arcs
h. vertex
i. segments
j. ruler
k. 360º
l. obtuse
m. protractor
n. lines
o. 180º
p. acute
1. the sides of an angle are (1 point)
2. when using three letters to name an angle, the middle letter represents the (1 point)
3. a(n) is a tool used to measure angles. (1 point)
4. angles are measured in units of (1 point)
5. there are methods for naming angles. (1 point)

Question 1.

The sides of an angle are rays  

Further Explanation: A ray  It is a part of a line with one end point and proceeds on in one direction. An angle  An 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. Question 2.

When using three letters to name an angle, the middle letter represents the vertex.

Further Explanation:

Angles 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. Question 3.

A Protractor is a tool used to measure angles.

Further Explanation; Angles are measured using a tool known as a protractor

How to measure the angle using a protractor

To 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. Question 4.

Angles are measured in units of degrees

Further Explanation Angles are measured using two common measurements. These measurements are degrees and minutes. Degrees is the commonly used measurement for measuring angles. A circle is divided into 360 degrees, a right angle is therefore equivalent to 90 degrees. Each degree is divided into 60 equal parts called minutes. Question 5.

There are three methods for naming angles.  

Further Explanation;

Angles 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.

Keywords: Rays, angles, vertex, protractor.

Learn more about; Angles: Rays: Units used to measure angles:

Level: Middle school  

Subject: Geometry  

Topic: Angles