Chapter 17
Shapes, Patterns and Symmetery
True or False
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1True or False.
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(a) All triangles are polygons.
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(b) A rectangle is a quadrilateral.
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(c) All quadrilaterals are squares.
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(d) A polygon is a closed curve.
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One Word Answer
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1Find the radii of the circles with the following diameters :
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(a) 12 cm
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(b) 20 cm
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(c) 34 cm
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(d) 56 cm
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(e) 8 cm
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(f) 46 cm
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(g) 70 cm
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(h) 26 cm
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2Find the diameter of the circles with the following radii:
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(a) 3 cm
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(b) 10 cm
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(c) 13 cm
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(d) 25 cm
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(e) 5 cm
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(f) 15 cm
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(g) 19 cm
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(h) 7 cm
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Fill in the Blanks
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1Fill in the blanks.
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(a) The radius is ___________ of the diameter.
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(b) The distance between the centre and any point on the circle is called___________.
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(c) The diameter of the circle is ___________ of its radius.
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(d) The length of a circle is called its ___________.
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(e) A circle is a ___________ figure.
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(f) The point where two or more diameter meet is called ___________.
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(g) The diameter goes through the ___________ of the circle.
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(h) Plural of radius is ___________.
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One Word Answer
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1Draw the circles with the following radii:
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(a) 2 cm
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(b) 3 cm
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(c) 1 cm
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(d) 4 cm
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2Draw the circles with the following diameters:
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(a) 2 cm
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(b) 3 cm
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(c) 1 cm
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(d) 4 cm
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3
Which of the following are simple closed curves ?
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A.
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A.
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4
Which of the following shapes are polygons ?
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A.
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A.
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5
Write down the names of following polygons.
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A.
(a)
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B.
(b)
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C.
(c)
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D.
(d)
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A.