AP State Syllabus AP Board 7th Class Maths Solutions Chapter 4 Lines and Angles Ex 4 Textbook Questions and Answers.

## AP State Syllabus 7th Class Maths Solutions 4th Lesson Lines and Angles Exercise 4

Question 1.

Which of the following are adjacent angles?

Solution:

(i)

i) a and b are adjacent angles.

ii) c and d are adjacent angles.

iii) e, f are not adjacent angles.

Question 2.

Name all pairs of adjacent angles in the figure. How many pairs of adjacent angles are formed? Why these angles are called adjacent angles?

Solution:

(∠AOL). ∠AOC). (∠AOC. ∠BOC)

(∠BOC. ∠BOD), (∠BOD. ∠AOD) are the four pairs of adjacent angles.

These are adjacent since they have a common vertex, common arm and on either sides of the common arm.

Question 3.

Can two adjacent angles be supplementary? Draw figure.

Solution:

Yes. Two adjacent angles can be supplementary.

Question 4.

Can two adjacent angles be complementary? Draw figure.

Solution:

Yes. Two adjacent angles can be complementary.

Question 5.

Give four examples of adj acent angles in daily life.

Example: Angles between the spokes at the centre ofa cycle wheel.

(i) ____________________________

(ii) ____________________________

(iii) ____________________________

(iv) ____________________________

Solution:

i) Angles between (Door and Wall). (Door and frame)

ii) Angles between the 3 hands of a clock at a point of time.

iii) Adjacent angles in the Rangoli.

iv) Angles between spokes of the window design.