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QUESTION: 1

Which of the following are the units of an angle?

Solution:

A common unit of measurement of angles is degrees.

QUESTION: 2

What do we call an angle which exactly measures 90^{o}?

Solution:

An angle which exactly measures 90^{o }is called a right angle.

QUESTION: 3

What do we call an angle whose measurement is exactly equal to 0^{o}?

Solution:

QUESTION: 4

What is an angle which measures exactly 180^{o} called?

Solution:

QUESTION: 5

Which instrument is used to measure or construct angles?

Solution:

A protractor is a measuring instrument, typically made of transparent plastic or glass, for measuring angles. Most protractors measure angles in degrees (°). Radian-scale protractors measure angles in radians.

QUESTION: 6

How many rays can be drawn from a given point?

Solution:

An infinite number of rays can be drawn from a point.

QUESTION: 7

What do we call a 169^{o} angle?

Solution:

An angle which lies between 90^{o }and 180^{o} is called as an obtuse angle. So, 169^{o} is an obtuse angle.

QUESTION: 8

What happens to the measurement of an angle after the extension of its arms?

Solution:

Extending the arms of an angle does not affect the angle between them.

QUESTION: 9

In ∠ROP, what is the vertex?

Solution:

The vertex of an angle is the common point of the rays that form the arms of an angle. Here, it is O.

QUESTION: 10

What are the two arms of ZDEF?

Solution:

are the two arms of ∠DEF.

QUESTION: 11

When two line segments meet at a point forming right angles, what type of segments are they called?

Solution:

Perpendicular segments meet at a point forming right angles.

QUESTION: 12

How is is perpendicular to written symbolically?

Solution:

QUESTION: 13

What is the measure of ∠QOR ?

Solution:

**The correct option is Option C.**

If OQ is perpendicular on PR, it means it forms right angles on both the sides.

∠QOP = ∠QOR = 180° ÷ 2 = 90°

QUESTION: 14

A line AB is parallel to the line CD. How is this symbolically written?

Solution:

QUESTION: 15

What are the lines which lie on the same plane and do not intersect at any point called?

Solution:

Since parallel lines are the lines which have equal distance throughout. So they never meet because they have constant distance between them.

QUESTION: 16

When two lines are parallel, what is the distance between them?

Solution:

The distance between the parallel lines is the same.

QUESTION: 17

What is the number of pairs of parallel lines in the given figure?

Solution:

There are two pairs of parallel lines as the opposite sides of a rectangle are parallel.

QUESTION: 18

What is the complementary angle of 20^{o}?

Solution:

Complementary angles add up to 90^{o} . ∠PQR = 20^{o }⇒ Its complementary angle is 90^{o}−20^{o }= 70^{o}

QUESTION: 19

What is the supplementary angle of 120^{o}?

Solution:

The sum of supplementary angles is 180o. ∠ABC = 120^{o} ⇒ Its supplementary angles add up to 180^{o}.

QUESTION: 20

What is the measure of a comple-mentary angle of an angle greater than 45^{o}?

Solution:

Since the complementary angle of 45° is 45°, if the angle is greater than 45° its complement will be lesser than 45°.

### Topics in Lines and Angles - Lines & Angles

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### Congruency of angles and lines - Lines & Angles

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### Review of lines and angles - Lines & Angles

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