DAV Class 7 Maths Chapter 13 Worksheet 3 Solutions

The DAV Class 7 Maths Book Solutions and DAV Class 7 Maths Chapter 13 Worksheet 3 Solutions of Symmetry offer comprehensive answers to textbook questions.

DAV Class 7 Maths Ch 13 WS 3 Solutions

Question 1.
How many lines of symmetry will a square have? Explain by paper folding.
Answer:

Take a square paper sheet and fold it 4 times along the dotted lines l₁ l₂, l₃ and l₄. Hence, the square has 4 lines of symmetry.

Question 2.
Give reasons to show how many lines of symmetry will a square have.
Answer:
A square has 4 lines of symmetry as it has 4 equal sides and 4 equal lines.

Question 3.
How many lines of symmetry will a general quadrilateral have?
Answer:
General quadrilateral has no line of symmetry.

Question 4.
How many lines of symmetry will a kite have? Draw the lines of symmetry of a kite.
Answer:
A kite has only one line of symmetry which will be the bisector of ∠A and ∠C of the kite quadrilateral ABCD in which AB = AD and BC = DC

Question 5.
How many lines of symmetry will an isosceles trapezium have? Draw these lines. (An isosceles trapezium is one whose non-parallel sides are equal).

Answer:
Isosceles trapezium ABCD in which AD = BC and AB ∥ DC has only one line of symmetry ‘l’ which is the perpendicular bisector of AB and DC.