The plane angle is the one that measures .
Plane angle
Which of the 4 angles shown in the figure corresponds to the description of the plane angle?
The correct answer is C) 180 °
Plane angle
Test yourself on types of aangles (right, acute, obtuse, flat)!
\( ∢\text{ABC} \) equal to 90°.
What angle is it?
If you are interested in learning more about other angle topics, you can enter one of the following articles:
- Angle Notation
- Sides, Vertices, and Angles
- Bisector
- Right Angle
- Adjacent Angles
- Vertically Opposite Angles
- Alternate Angles
- Corresponding Angles
- Sum of the Angles of a Triangle
- Sum of the Angles of a Polygon
- Sum and Difference of Angles
On the website of Tutorela you will find a variety of articles on mathematics.
Examples and exercises with solutions of plane angle
Exercise #1
True or false?
One of the angles in a rectangle may be an acute angle.
Video Solution
Step-by-Step Solution
One of the properties of a rectangle is that all its angles are right angles.
Therefore, it is not possible for an angle to be acute, that is, less than 90 degrees.
Answer
False
Exercise #2
True or false?
An acute angle is smaller than a right angle.
Step-by-Step Solution
The definition of an acute angle is an angle that is smaller than 90 degrees.
Since an angle that equals 90 degrees is a right angle, the answer is correct.
Answer
True
Exercise #3
If the two adjacent angles are not equal to each other, then one of them is obtuse and the other acute.
Video Solution
Step-by-Step Solution
The answer is correct because the sum of two acute angles will be less than 180 degrees and the sum of two obtuse angles will be greater than 180 degrees
Answer
True
Exercise #4
Which figure depicts a right angle?
Video Solution
Step-by-Step Solution
A right angle is equal to 90 degrees. In diagrams A+C, we see that the angle symbol is a symbol representing an angle that equals 90 degrees.
Answer
Exercise #5
Which of the following angles are obtuse?
Video Solution
Step-by-Step Solution
By definition, an obtuse angle is an angle that is greater than 90 degrees. We can see that in one drawing there is an angle of 90 degrees and therefore it is not an obtuse angle, the other two angles are less than 90 degrees meaning they are also not obtuse, they are acute angles.
Therefore, none of the answers is correct.
Answer
None of the options
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Test your knowledge
Question 1
What type of angle is
\( ∢\text{ABC} \) ?
Question 2
\( ∢\text{ABC} \) is an angle measuring less than 90°.
What kind of angle angle is it?
Question 3
right angle?
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