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11 Symmetryy
11
Symmetr
Learning Outcomes
In this chapter, you will learn about:
� Symmetry � Reflection symmetry � Rotational symmetry
� Rotation through 90° and 180° for polygons
Boot-Up (To Recapitulate Previous Knowledge of Concepts)
COMPETENCY BASED QUESTIONS
A. Multiple-Choice Questions
1. Which of the following has no line of symmetry?
(i) U (ii) S (iii) H (iv) A
2. Find the number of lines of symmetry in a scalene triangle.
(i) 3 (ii) 2 (iii) 0 (iv) 1
3. Which of the following have both horizontal as well as vertical line of symmetry?
(i) P (ii) B (iii) I (iv) Z
4. Which of the following letters looks the same after reflection when the mirror is placed vertically?
(i) Q (ii) P (iii) S (iv) H
B. Fill in the Blanks
1. A circle has ________________ lines of symmetry.
2. An angle is symmetrical about its ________________.
3. An equilateral triangle has ________________ lines of symmetry.
4. A line of symmetry of an object is also called its ________________ of symmetry.
C. Write ‘T’ for true and ‘F’ for false Statements
1. A rectangle has 4 lines of symmetry.
2. A line of symmetry divides a figure into two identical parts.
3. A regular pentagon has 5 lines of symmetry.
4. A letter N has one line of symmetry.
