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14SymmetryElicitWarm-up1. Fill in the blanks.a.....letters in the English alphabet look the same after a half turn (180 degrees).b. All rectangles have an order of rotational symmetry ofc. All squares have an order of rotational symmetry of .d. The order of rotational symmetry of a triangle whose all sides are equal is ..2. The angle of symmetry of every ﬁgure is 360°. Yes/NoRiya, look atthis butterﬂy. Whydoes it have only onewing?Learning ObjectivesIn this chapter, you will learn about:• Symmetry• Line of symmetry• Figures with two and multipleslines of symmetry• Reﬂection symmetry•Lines of symmetry in geometricﬁgures and letters of the EnglishalphabetNo Pankaj, the butterﬂy hasboth wings. However, they arefolded together and are of the samesize. So, it appears as if there isonly one wing. The butterﬂy's wingsare symmetrical. Let us understandabout symmetryin detail.194

Chapter ReviewFLUENCY1-34-67-10ULTIPLE CHOICE QUESTIONS• How many lines of symmetry are there in a rectangle?2b. 1C.4Which of the following does not have any lines of symmetry?a. Squareb. Circle• Which of the following has two lines of symmetry?Rectangleb. Square• Which of the following letters has a vertical line of symmetry?a. BMParallelogramc. Equilateral triangleC.C• How many lines of symmetry are there in an isosceles triangle?a.3C.2• Which type of symmetry is found there in letter C?a. VerticalHorizontal• A regular pentagon (ﬁve sides) has.c. No lines of symmetrylines of symmetry.5a. lb. 2. An inﬁnite number of lines of symmetry can be drawn in a ..a. squarebcirclec. pentagon• The number of lines of symmetry in a scalene (all sides unequal) triangle is:b. 2C.3). Which letter has both vertical and horizontal lines of symmetry?b. ACC.PROBLEM-SOLVINGJBJECTIVE QUESTIONSI. How many lines of symmetry does a butterﬂy have?.. Which English letter has an inﬁnite number of lines of symmetry?. Name two polygons having both vertical and horizontal lines of symmetry.t. Draw any one ﬁgure with multiple lines of symmetry.5. Draw lines of symmetry in a regular hexagon.5. Draw lines of symmetry in a square and a rhombus.1. Name the types of triangles in each of the following case:a. Three lines of symmetryb. One line of symmetry3. List three English letters having two lines of symmetry.). List the types of symmetry found in each letter of the word 'SYMMETRY.0. List ﬁve letters that do not have any lines of symmetry.d.3d. Rhombusd. Isosceles triangled. Dd. 0d. Vertical and horizontald. 4d. parallelogram1-3d. B4-67-10c. No lines of symmetry201

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