Angles in Trigonometry

Is an angle of 155° acute or obtuse?

• straight
• obtuse
• zero
• right

Is an angle of 35° acute or obtuse?

• acute
• straight
• zero
• right

Is an angle of 20° acute or obtuse?

• zero
• acute
• straight
• right

Which type of angle measures 0°?

• acute angle
• obtuse angle
• zero angle
• right angle

Which type of angle measures 180°?

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

Which type of angle measures 90°?

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