The types of angles shown in the triangle would be:
- c. ∠ 3 : Acute
- d. ∠ 4 : Obtuse
- h. ∠ 8 : Obtuse
- i. ∠ 9 : Obtuse
How to find the angle classification?
An acute angle is defined as an angle with a measurement of less than 90 degrees. An obtuse angle is characterized by an angle measurement that falls between 90 degrees and 180 degrees. A right angle is precisely 90 degrees in measurement.
Angle ∠3 has a measurement of less than 90 degrees, classifying it as an acute angle. Angle ∠4 falls within the range of more than 90 degrees but less than 180 degrees, making it an obtuse angle.
The same holds true for angles ∠8 and ∠9, as they also have measurements between 90 and 180 degrees, categorizing them as obtuse angles.