Naming Angles Worksheet

**Page 2**

11.

Match the items in the table.

a. | 1-(ii), 2-(iii), 3-(iv) and 4-(i) | ||

b. | 1-(iv), 2-(i), 3-(ii) and 4-(iii) | ||

c. | 1-(iv), 2-(iii), 3-(i) and 4-(ii) | ||

d. | 1-(ii), 2-(i), 3-(iv) and 4-(iii) |

Figure- (ii) represents an acute angle.

Figure- (iii) represents straight angle.

Figure- (iv) represents an obtuse angle.

The correct choice is 1-(iv), 2-(i), 3-(ii) and 4-(iii).

Correct answer : (2)

12.

Which of the figures represents the angle 180°?

a. | Figure (d) | ||

b. | Figure (b) | ||

c. | Figure (c) | ||

d. | Figure (a) |

Angle in the Figure (b) represents an acute angle. It measures approximately 45°.

Angle in the Figure (c) represents an obtuse angle. It measures approximately 120°.

Figure (d) represents an acute angle of approximately 60°

So, only Figure (a) represents the angle 180°.

Correct answer : (4)

13.

Find the measure of the angle in the figure.

a. | 50° | ||

b. | 100° | ||

c. | 90° | ||

d. | 180° |

Right angle measures 90°.

So, the measure of the angle in the figure is 90°.

Correct answer : (3)

14.

What is the measure of the angle in the figure?

a. | 100° | ||

b. | 180° | ||

c. | 90° | ||

d. | 130° |

From the choices, 100°, 130° are the obtuse angles.

In the figure, the angle is not nearer to right angle. So, the measure of the angle in the figure is not 100°.

The measure of the angle in the figure is 130°.

Correct answer : (4)

15.

Which of the figures represents an acute angle?

a. | Figure (b) | ||

b. | Figure (c) | ||

c. | Figure (a) | ||

d. | Figure (d) |

Angle in the Figure (b) represents right angle.

Angle in the Figure (c) represents an obtuse angle.

Angle in the Figure (d) represents an acute angle.

So, Figure (d) is the correct choice.

Correct answer : (4)

16.

What kind of angle is $\angle $ABC?

a. | right angle | ||

b. | obtuse angle | ||

c. | acute angle | ||

d. | straight angle |

The angle, which is less than 90

So,

Correct answer : (3)

17.

"The sum of two acute angles is equal to an obtuse angle." - Which of the following is correct about this statement?

a. | Always false | ||

b. | Always true | ||

c. | Sometimes true | ||

d. | None of the above |

Acute angle measures less than 90

Consider the two acute angles as 35

85

Consider the two acute angles as 67

143

So, the statement is sometimes true and sometimes false.

Correct answer : (3)

18.

Choose the term that properly comments on the validity of the statement, 'Straight angle is another name for an obtuse angle'.

a. | Always true | ||

b. | Sometimes false | ||

c. | Always false | ||

d. | None of the above |

So, an obtuse angle never measures 180

So, the statement is always false.

Correct answer : (3)

19.

Select the term that correctly comments on the validity of the statement, 'Two times the measure of an obtuse angle is equal to the measure of the straight angle'.

a. | Sometimes it can be false | ||

b. | Always false | ||

c. | Always true | ||

d. | None of the above |

Straight angle measures 180

Two times the measure of an obtuse angle is greater than 180

So, the statement is always false.

Correct answer : (2)

20.

Which of the following sides form the angle 60^{o} in the figure?

a. | BD and BC | ||

b. | CB and DB | ||

c. | AB and BD | ||

d. | AB and BC |

From the figure the angle 60

Correct answer : (4)