# Lines and Angles – Class 7.

**Chapter 5 of NCERT/CBSE class 7 Maths is about Lines And Angles .Here in this lesson you can find practice problems for this chapter.**

**CBSE Class 7 Mathematics / Model QuestionsLines and Angles – Chapter 5Fill in the blanks:**

- A line segment has ——— end points.
- The complement of 30 degree is ———-
- The supplement of 123 degree is ———
- The angles in a linear pair are ——-
- If two adjacent angles are supplementary, they form a ————
**Answer the following:** - The difference in the measures of two complementary angles is 12 degree. Find the measures of the angles?
- Among two supplementary angles the measure of the larger angle is 44 degree more than the measure of the smaller. Find their measures
- Find examples for transversal from your surroundings.
- Write two pairs of complementary angles.
- Write two pairs of supplementary angles.

**ANSWERS:**

- Two
- 60 degree
- 57 degree
- Supplementary
- Linear pair
- Let one angle be x.

Since these two angles are complementary, we can take other angle as 90 – x.

According to the given condition, x – (90 – x) = 12

x – 90 + x = 12

2x – 90 = 12

2x = 90 + 12 = 102

x = 102/2 = 51

So one angle is 51 and other angle is 90 – 51 = 39. - Let smaller angle be x and larger angle be 44 + x.

Since these two angles are supplementary, x + 44+ x = 180

2x + 44 = 180

2x = 180 – 44 = 136

x = 136/2 = 68

So the smaller angle is 68 and larger angle is 44 + 68 = 112 degree - i)A road crossing two or more roads.

ii) A railway line crossing several other lines. - 70, 20 and 45, 45.
- 110, 70 and 90, 90.