Example 1 · level 1
What type of angle is an angle of 180°?
- obtuse
- straight
- right
- acute
Show solution
- 180° is exactly 180°, so it is straight.
Answer: straight
CLASS 5 MATHS · SHAPES AND ANGLES
Angles: acute, right, obtuse, straight
Acute < 90°, right = 90°, obtuse between 90° and 180°, straight = 180°. Clock hands move 30° per hour mark.
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Worked examples
Example 2 · level 2
What type of angle is an angle of 170°?
- acute
- obtuse
- straight
- right
Show solution
- 170° is between 90° and 180°, so it is obtuse.
Answer: obtuse
Example 3 · level 3
What is the smaller angle (in degrees) between the hands of a clock at 3 o’clock?
Show solution
- 3 × 30° = 90°, which is a right angle.
Answer: 90