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Topic:class:

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Angles7 TH

Programmed Instructional material

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ObjectivesAt the end of this module you will be able to-To know about definition of angles.To know about there types.To draw and identify different angles.

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Angles • A figure formed by two rays with a common

initial point is called an angle.• It is denoted by ‘>’. • In a figure, an angle is formed by rays BA & BC. BA and BC are the arms of the angles and the common

initial point B is called the vertex.

Lets answer some questionsanswer 3

Lets answer some questionsanswer 4

Types of angles• Definition • When two arms of an angle overlap each other , the angle formed between

is zero angle.• An angle which measures between 0◦ and 90◦ is called acute angle• An angle which measure 90◦ is called a right angle.• An angle which measure more than 90◦ but less than 180◦ is called a obtuse

angle.• An angle which measure 180◦ is called a straight angle.• An angle which measure more than 180◦ but less than 360◦ is called a reflex

angle.• When the sum of two angle are 90◦ is known as complementary angle.• When the sum of two angles are 180◦ is known as supplementary angle.• An angles which measure is 360◦ is known as complete angle.

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Q1: An angle is formed by joining______rays.

-2

-4

-3

-5

B

C

D

A

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Hint!

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Hint!

1

2 An angle.

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A) Congratulations you have selected Right Answer!

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Q 2:common initial point of an angle is known as ________

-Bisector .

-Vertex.

-Diagonal.

-Arms.

B

C

D

A

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Hint!

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Hint!

An angle.

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Q3: The zero angle is the angle in which both the arms __________

- Does not overlaps.

-Coincides.

-Never overlaps.

-overlaps.

B

C

D

A

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Hint!

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Hint!

0°angle

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Q 4:The angles which measure between 0° to 90° is termed as_________ angle.

-Acute.

-Right.

-Obtuse.

-Reflex.

B

C

D

A

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Hint!

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Hint!

45°

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Q5:Which angle is formed if its measures 90° ?

-Zero.

-Acute

-Obtuse.

- Right.

B

C

D

A

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Hint!

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Hint!

90°

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D) Congratulations you have selected Right Answer!

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Q6:The angle which measures between 90° to 180° is termed as _________ angle.

-Right.

-Acute.

-Obtuse.

-Straight.

B

C

D

A

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Hint!

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Hint!

115°

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C)Congratulations you have selected Right Answer!

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Q7: _______ angle measures 180°.

-Zero.

-Straight

-Obtuse.

-Acute.

B

C

D

A

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Hint!

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Hint!

180°

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B)Congratulations you have selected Right Answer!

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Q8:An angle which measure more than 180° but less than 360°is called _______ angle.

-Right.

-Acute.

-Complete.

- Reflex.

B

C

D

A

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Hint!

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Hint!

285°

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Congratulations you have Scored 80 marks!