The DAV Class 7 Maths Book Solutions and DAV Class 7 Maths Chapter 13 Worksheet 4 Solutions of Symmetry offer comprehensive answers to textbook questions.
DAV Class 7 Maths Ch 13 WS 4 Solutions
Question 1.
How many lines of symmetry will a regular heptagon (seven sided polygon) have?
Answer: Regular heptagon (Seven sided polygon) has 7 lines of symmetry as it has 7 sides.
Question 2.
How many lines of symmetry will a regular octagon (eight sided polygon) have?
Answer:
Octagon has 8 sides. Therefore, it will have eight lines of symmetry.
Question 3.
Draw a square and draw its lines of symmetry.
Answer:
2 lines of symmetry are through its two pairs of opposite comers.
2 lines of symmetry are the perpendicular bisectors of opposite pairs of parallel sides.
∴ Total number of lines of symmetry of a square is 4.