Angles in Trigonometry

Which type of angle measures 25°?

• acute angle
• right angle
• straight angle
• obtuse angle

Which type of angle measures 15°?

• obtuse angle
• straight angle
• right angle
• acute angle

Which type of angle measures 10°?

• straight angle
• right angle
• acute angle
• obtuse angle

In introductory trigonometry, what does ‘obtuse angle’ mean?

• the side next to every angle
• the total distance around a triangle
• a line that always points upward
• an angle greater than 90° but less than 180°

In introductory trigonometry, what does ‘acute angle’ mean?

• the total distance around a triangle
• a line that always points upward
• an angle smaller than 90°
• the side next to every angle

In introductory trigonometry, what does ‘right angle’ mean?

• a line that always points upward
• the side next to every angle
• the total distance around a triangle
• an angle of exactly 90°