Geometric measurement: understand concepts of angle and measure angles - 4th Grade Math
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Solve for x.

Solve for x.
The angle is a straight line. A straight line is
. To find the missing angle we subtract.

The angle is a straight line. A straight line is . To find the missing angle we subtract.
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Solve for x.

Solve for x.
To find the value of x we subtract.

To find the value of x we subtract.
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Solve for x.

Solve for x.
To find the value of x we subtract.

To find the value of x we subtract.
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Solve for x.

Solve for x.
To find the value of x we subtract.

To find the value of x we subtract.
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Solve for x.

Solve for x.
To find the value of x we subtract.

To find the value of x we subtract.
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Solve for x.

Solve for x.
To find the value of x we add both of the known angles together.

To find the value of x we add both of the known angles together.
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Find the value of x.

Find the value of x.
When we have an angle with a square symbol in the corner, that means we have a right angle, or a
angle.
When we have an angle with a square symbol in the corner, that means we have a right angle, or a angle.
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Solve for x.

Solve for x.
To solve for x we subtract.

To solve for x we subtract.
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Solve for x.

Solve for x.
To solve for x we subtract.

To solve for x we subtract.
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Solve for x.

Solve for x.
Because of the square in the corner of the angle we have a
angle. To find the missing piece of the angle we subtract.

Because of the square in the corner of the angle we have a angle. To find the missing piece of the angle we subtract.
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If we wanted to make this angle into a straight line, how many more degrees would we need to add?

If we wanted to make this angle into a straight line, how many more degrees would we need to add?
A straight line has a measurement of
. We can subtract to find how much more we'd need to have a straight line.

A straight line has a measurement of . We can subtract to find how much more we'd need to have a straight line.
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If we wanted to make this angle into a right angle, how many more degrees would we need to add?

If we wanted to make this angle into a right angle, how many more degrees would we need to add?
A right angle has a measurement of
. To find how much more we would need to add we subtract.

A right angle has a measurement of . To find how much more we would need to add we subtract.
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What is an angle that measures less than
called?
What is an angle that measures less than called?
By definition, an acute angle is any angle that measures less than
.
By definition, an acute angle is any angle that measures less than .
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Two rays that meet at one point, an endpoint, is called ___________.
Two rays that meet at one point, an endpoint, is called ___________.
By definition, an angle is composed of two rays that meet at a point, called the endpoint.
By definition, an angle is composed of two rays that meet at a point, called the endpoint.
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The image below can be described as a ___________.

The image below can be described as a ___________.
A line segment is a straight line that has a starting point and an ending point.
A line segment is a straight line that has a starting point and an ending point.
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What is an angle that measures more than
, but less than
called?
What is an angle that measures more than , but less than
called?
By definition, and obtuse angle is any angle that measure more than
, but less than
.
By definition, and obtuse angle is any angle that measure more than , but less than
.
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What is a
degree angle called?
What is a degree angle called?
By definition, a right angle measures
.
By definition, a right angle measures .
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An angle that measures
is called ___________.
An angle that measures is called ___________.
By definition, a straight angle measures
.
By definition, a straight angle measures .
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The image below can be described as a ___________.

The image below can be described as a ___________.
By definition, a ray starts at a point and continues in a certain direction, with no endpoint.
By definition, a ray starts at a point and continues in a certain direction, with no endpoint.
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The image below can be described as ___________.

The image below can be described as ___________.
This image is an angle because it shows two rays meeting at an endpoint.
This image is an angle because it shows two rays meeting at an endpoint.
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