Lines and Angles – Chapter 4/CBSE Class 7 Maths Worksheet

Lines and Angles – Chapter 4/Worksheet is about the important questions that you can expect for Yearly Examination. Here you can find out practice problems for Class 7 Mathematics. This Worksheet is designed for CBSE Class 7 students.

Important Questions for CBSE Class 7 Mathematics
Lines and Angles – Chapter 4/Worksheet
Fill in the blanks:

1. The complement of the angle 30 degree is —————-
2. Angles which are supplementary and vertically opposite are ———–
3. One of the angles in a linear pair is 80 degrees, then the other angle is —-
4. The angle which is equal to its complement is —————-
5. Two angles are said to be supplementary, if their sum is ——– degree.
   Answer the following:
6. Find the complement of each of the following angles:
   i) 45 degree
   ii) 80 degree
7. Find the supplement of the following angles:
   i) 110 degree
   ii) 50 degree
8. If the angles 2x + 3 and 4x – 3 are supplementary angles, find the value of x?
9. Find the angle which makes a linear pair with the following angles:
   i) 125 degree
   ii) 85 degree
10. Which of the following pairs of angles are complementary?
    i) 25 degree and 65 degree
    ii) 95 degree and 85 degree

ANSWERS:

1. 60 degree
2. 90 degree, 90 degree
3. 100 degree
4. 45 degrees
5. 180 degree
6. i) Complement of 45 degree is 90 – 45 = 45 degree
   ii) Complement of 80 degree is 90 – 80 = 10 degree
7. i) Supplement of 110 degree is 180 – 110 = 70 degree
   ii) Supplement of 50 degree is 180 – 50 = 130 degree
8. Given 2x + 3 + 4x – 3 = 180 degree (Since it is supplementary)
   6x = 180
   x = 180/6 = 30 degree
9. i) 180 – 125 = 55 degree
   ii) 180 – 85 = 95 degree
10. i) Since 25 + 65 = 90 degree, it is complementary
    ii) Since 95 + 85 = 180 degree, it is supplementary.