Types of angles (right, acute, obtuse, flat) - Examples, Exercises and Solutions

Definition of plane angle:

The plane angle is the one that measures 180° 180° .

Plane angle

A1 -plane angle

Which of the 4 angles shown in the figure corresponds to the description of the plane angle?

what is the definitions of 4 angles

The correct answer is C) 180 °

Practice Types of angles (right, acute, obtuse, flat)

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?

The sum of two acute angles can be greater than 180 degrees?

Video Solution

Answer

False.

Exercise #3

Does the drawing show an adjacent angle?

Video Solution

Answer

Not true

Exercise #4

Does the drawing show an adjacent angle?

Video Solution

Answer

Not true

Exercise #5

Does the drawing show an adjacent angle?

Video Solution

Answer

Not true

Exercise #1

Does the drawing show an adjacent angle?

Video Solution

Answer

Not true

Exercise #2

Does the drawing show an adjacent angle?

Video Solution

Answer

Not true

Exercise #3

Does the drawing show an adjacent angle?

Video Solution

Answer

Not true

Exercise #4

If the two adjacent angles are not equal to each other, then one of them is obtuse and the other acute.

Video Solution

Answer

True

Exercise #5

Does the drawing show an adjacent angle?

Video Solution

Answer

True

Exercise #1

Which of the following angles is a plane angle?

Video Solution

Answer

Exercise #2

Which figure shows a right angle?

Video Solution

Answer

Exercise #3

Which of the following angles is obtuse?

Video Solution

Answer

Exercise #4

Which of the following angles is obtuse?

Video Solution

Answer

Exercise #5

Which of the following angles is obtuse?

Video Solution

Answer

91°

Topics learned in later sections

  1. Right angle
  2. Acute Angles
  3. Obtuse Angle
  4. Angle Notation
  5. Angle Bisector
  6. The Sum of the Interior Angles of a Triangle
  7. Sides, Vertices, and Angles
  8. Types of Angles
  9. Sum and Difference of Angles
  10. Sum of Angles in a Polygon
  11. Exterior angle of a triangle