Acute Angles - Examples, Exercises and Solutions

Definition of an acute angle

An acute angle is an angle that measures less than $90°$.

Acute angles can appear in triangles, parallelograms, and other geometric shapes where there is an angle less than $90°$ degrees.

Acute angle

Which of the 4 angles presented in the figure corresponds to the description of the acute angle?

The correct answer is B) 40°

Practice Acute Angles

Exercise #1

True or false?

One of the angles in a rectangle may be an acute angle.

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.

False

Exercise #2

True or false?

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

False.

Exercise #3

Does the drawing show an adjacent angle?

Not true

Exercise #4

Does the drawing show an adjacent angle?

Not true

Exercise #5

Choose the appropriate triangle according to the following:

Angle B equals 90 degrees.

Exercise #1

Which of the angles is not an obtuse angle?

Exercise #2

Which of the following angles is a plane angle?

Exercise #3

Which of the following angles is obtuse?

91°

Exercise #4

Which of the following angles is obtuse?

Exercise #5

Which figure shows a right angle?

Exercise #1

Which figure depicts a right angle?

Exercise #2

Which of the following angles are obtuse?

Video Solution

None of the options

Exercise #3

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

True

Exercise #4

Does the drawing show an adjacent angle?

True

Exercise #5

Does the drawing show an adjacent angle?