Acute or Obtuse? Angle Classification for 4th Graders

A triangle has one angle that measures 30 degrees. Is this angle acute or obtuse?

• obtuse

• acute

• right

• straight

A clock shows the minute hand pointing at 3 and the hour hand pointing at 12. What type of angle is formed between the hands?

• straight angle

• acute angle

• obtuse angle

• right angle

In a park, a slide has an angle of 120 degrees. Is this angle acute or obtuse?

• Obtuse

• Straight

• Right

• Acute

A pizza is cut into 8 equal slices. Each slice has an angle of 45 degrees. Are these angles acute or obtuse?

• acute

• right

• straight

• reflex

A door opens to form a 95-degree angle with the wall. Is this angle acute or obtuse?

• right

• obtuse

• reflex

• straight

A triangle has angles measuring 50 degrees, 60 degrees, and 70 degrees. Are any of these angles obtuse?

• One angle is 50 degrees, which is obtuse.

• The triangle has two obtuse angles.

• All angles are acute, but one is close to being obtuse.

• No, none of the angles are obtuse.

A ramp is built at an angle of 30 degrees. Is this angle acute or obtuse?

• obtuse

• straight

• right

• acute

A protractor shows an angle of 150 degrees. What type of angle is this?

• Straight angle

• Obtuse angle

• Right angle

• Acute angle

A classroom has a corner that forms a right angle of 90 degrees. Is this angle acute or obtuse?

• Obtuse

• Acute

• Neither acute nor obtuse

• Straight

A kite is flying at an angle of 75 degrees. Is this angle acute or obtuse?

• obtuse

• right

• straight

• acute