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 Questions
Lines and Angles – Chapter 5
Fill in the blanks:

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

ANSWERS:

1. Two
2. 60 degree
3. 57 degree
4. Supplementary
5. Linear pair
6. 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.
7. 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
8. i)A road crossing two or more roads.
   ii) A railway line crossing several other lines.
9. 70, 20 and 45, 45.
10. 110, 70 and 90, 90.