Naming Angles Worksheet

**Page 1**

1.

UC and UT are opposite rays. $\angle $CUT is _________ .

a. | a complete angle | ||

b. | a supplementary angle | ||

c. | an obtuse angle | ||

d. | a straight angle |

Straight angle = 180

So,

Correct answer : (4)

2.

Which of the following choices is correct for the statement, 'a straight angle is two times a right angle'?

a. | Always true | ||

b. | False | ||

c. | Some times true | ||

d. | None of the above |

Two times a right angle = 2 × 90

The statement is always true.

Correct answer : (1)

3.

Find the measure of $\angle $ABC.

a. | 115° | ||

b. | 85° | ||

c. | 75° | ||

d. | 65° |

On the protractor scale,

The measure of

Correct answer : (4)

4.

Find the measure of $\angle $PQR.

a. | 100° | ||

b. | 70° | ||

c. | 180° | ||

d. | 120° |

On the protractor scale,

The measure of

Correct answer : (1)

5.

Find the measure of $\angle $STU.

a. | 105° | ||

b. | 45° | ||

c. | 135° | ||

d. | 180° |

On the protractor scale,

Difference = 180° - 45° = 135°.

[Subtract.]

The measure of

Correct answer : (3)

6.

Find the measure of $\angle $KLM.

a. | 160° | ||

b. | 180° | ||

c. | 30° | ||

d. | 20° |

On the protractor scale,

Difference = 180° - 160° = 20°.

[Subtract.]

The measure of

Correct answer : (4)

7.

What is the measure of $\angle $TQP?

a. | 40° | ||

b. | 120° | ||

c. | 30° | ||

d. | 110° |

On the protractor scale,

Difference = 140° - 30° = 110°.

[Subtract.]

The measure of

Correct answer : (4)

8.

Name the angle.

a. | $\angle $RPQ | ||

b. | $\angle $QPR | ||

c. | $\angle $PRQ | ||

d. | $\angle $RQP |

In the figure, there are two rays

Q is the vertex and QP, QR are two rays.

So, the angle made by the two rays and the common endpoint is

Correct answer : (4)

9.

If one angle of a linear pair is acute, then what is the other angle?

a. | Acute Angle | ||

b. | Obtuse Angle | ||

c. | Right Angle | ||

d. | None of the above |

Acute angle is one whose measure is less than 90

Hence, in a linear pair, if one angle is acute (below 90

Correct answer : (2)

10.

A 42 mm lens has a 80° viewing angle. What kind of angle is this?

a. | acute | ||

b. | obtuse | ||

c. | reflex | ||

d. | right |

If the angle is below 90°, then the angle is called an acute angle.

80° < 90°. So, the viewing angle is an acute angle.

Correct answer : (1)