Compare angles with right angles and recognise acute, obtuse, straight, reflex and full turns.
Example 1
Compare the coloured angle A with the separate right angle R. Which name describes angle A?
Compare angles A and RShow worked answer
Answer: Acute angle
- A is smaller than the right angle R, so A is acute.
Example 2
Compare the coloured angle A with the separate right angle R. Which name describes angle A?
Compare angles A and RShow worked answer
Answer: Acute angle
- A is smaller than the right angle R, so A is acute.
Example 3
Which name describes the angle marked by the coloured arc?
Marked angleShow worked answer
Answer: Straight angle
- The marked turn is two right angles, forming a straight angle.