# 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 MathematicsLines and Angles – Chapter 4/WorksheetFill in the blanks:**

**The complement of the angle 30 degree is —————-****Angles which are supplementary and vertically opposite are ———–****One of the angles in a linear pair is 80 degrees, then the other angle is —-****The angle which is equal to its complement is —————-****Two angles are said to be supplementary, if their sum is ——– degree.**

Answer the following:**Find the complement of each of the following angles:**

i) 45 degree

ii) 80 degree**Find the supplement of the following angles:**

i) 110 degree

ii) 50 degree**If the angles 2x + 3 and 4x – 3 are supplementary angles, find the value of x?****Find the angle which makes a linear pair with the following angles:**

i) 125 degree

ii) 85 degree**Which of the following pairs of angles are complementary?**

i) 25 degree and 65 degree

ii) 95 degree and 85 degree

**ANSWERS:**

**60 degree****90 degree, 90 degree****100 degree****45 degrees****180 degree****i) Complement of 45 degree is 90 – 45 = 45 degree**

ii) Complement of 80 degree is 90 – 80 = 10 degree**i) Supplement of 110 degree is 180 – 110 = 70 degree**

ii) Supplement of 50 degree is 180 – 50 = 130 degree**Given 2x + 3 + 4x – 3 = 180 degree (Since it is supplementary)**

6x = 180

x = 180/6 = 30 degree**i) 180 – 125 = 55 degree**

ii) 180 – 85 = 95 degree**i) Since 25 + 65 = 90 degree, it is complementary**

ii) Since 95 + 85 = 180 degree, it is supplementary.