Angles — Multiple Choice Questions

An angle measuring 210° is

1. an obtuse angle

2. a straight angle

3. a reflex angle

4. a complete angle

Answer

An angle whose measure is more than 180° but less than 360° is a reflex angle. Since 180° < 210° < 360°, the angle is a reflex angle.

Hence, option 3 is the correct option.

An angle measuring 340° is

1. an obtuse angle

2. a reflex angle

3. a complete angle

4. a straight angle

Answer

An angle whose measure is more than 180° but less than 360° is a reflex angle. Since 180° < 340° < 360°, the angle is a reflex angle.

Hence, option 2 is the correct option.

An angle measuring 92° is

1. a right angle

2. an acute angle

3. an obtuse angle

4. a straight angle

Answer

An angle whose measure is more than 90° but less than 180° is an obtuse angle. Since 90° < 92° < 180°, the angle is an obtuse angle.

Hence, option 3 is the correct option.

An angle measuring 180° is

1. a straight angle

2. an acute angle

3. an obtuse angle

4. a reflex angle

Answer

An angle whose measure is 180° is a straight angle.

Hence, option 1 is the correct option.

An angle measuring 360° is

1. a straight angle

2. a complete angle

3. an obtuse angle

4. a reflex angle

Answer

An angle whose measure is 360° is a complete angle.

Hence, option 2 is the correct option.

How many degrees are there in $\dfrac{5}{6}$ of a complete angle?

1. 150°

2. 75°

3. 300°

4. none of these

Answer

We know that 1 complete angle = 360°.

⇒ $\dfrac{5}{6}$ of a complete angle = $\dfrac{5}{6}$ × 360° = 300°.

Hence, option 3 is the correct option.

A reflex angle measures

1. more than 90° but less than 180°

2. more than 180° but less than 270°

3. more than 180° but less than 360°

4. none of these

Answer

A reflex angle is an angle whose measure is more than 180° but less than 360°.

Hence, option 3 is the correct option.

The measure of a straight angle is

1. 90°

2. 180°

3. 270°

4. 360°

Answer

The measure of a straight angle is 180°.

Hence, option 2 is the correct option.