Testinar Grade 4 math

Angles as Geometric Shapes

Students will recognize an angle as a geometric shape formed by two rays with a common endpoint.

CH07-05 Measurement, Data, and Angles

Directions Solve each problem. Show your reasoning on the page or on separate paper. Check the answer key only after finishing.

An angle is formed wherever two rays share a common:
1. line
2. endpoint
3. segment
4. circle
Which part of an angle is the point where the two rays meet?
1. The side
2. The vertex
3. The arc
4. The exterior
How many rays make up an angle?
1. 1
2. 2
3. 3
4. 4
The sides of an angle are:
1. segments
2. lines
3. rays
4. circles
What is labeled with the letter \(V\) in the diagram above?
1. A ray
2. The vertex
3. The arc
4. A side
The space inside an angle is called:
1. the exterior
2. the arc
3. the interior
4. the vertex
The space outside an angle is called:
1. the interior
2. the exterior
3. the vertex
4. a side
Which part of the angle is labeled blue?
1. The vertex
2. The sides
3. The interior
4. The exterior

Teacher and parent reference

Answer key and explanations

B. endpoint
An angle is formed by two rays that share a common endpoint, called the \(\mathbf{\text{vertex}}\).
B. The vertex
The \(\mathbf{\text{vertex}}\) is the point where the two rays of an angle meet.
B. 2
An angle always has exactly \(\mathbf{2}\) rays that start at a common endpoint.
C. rays
The two rays forming an angle are called the \(\mathbf{\text{sides}}\) (or rays) of the angle.
B. The vertex
Point \(V\) marks the \(\mathbf{\text{vertex}}\)---the point where the two rays meet.
C. the interior
The \(\mathbf{\text{interior}}\) of an angle is the space inside, between the two rays.
B. the exterior
The \(\mathbf{\text{exterior}}\) of an angle is all the space outside the angle.
C. The interior
The blue-labeled region is the \(\mathbf{\text{interior}}\), the space between the two rays.