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Which of the following quadrilaterals is not a parallelogram?

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Important Questions on Understanding Elementary Shapes

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Name of the quadrilateral.

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A quadrilateral with opposite sides (Only one pair) parallel is called _____.

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In a square all the sides are _____. (equal/unequal)

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Name of the following quadrilateral.

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Draw a rough sketch of a quadrilateral PQRS. Draw its diagonals. Name them. Is the meeting point of the diagonals in the interior or exterior of the quadrilateral?
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Identify the figure as triangle and quadrilateral. Give reasons.

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Draw rough sketches of concave and convex quadrilaterals. Explain the properties which differentiate them.
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A _____ is a kind of parallelogram.

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The two diagonals of a quadrilateral are 5 cm and 4 cm. Can it be a rectangle? Give reasons.
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Name of the following quadrilateral.

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State the properties of a rhombus.
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Draw the shape of the book. Name the shape.
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Give reasons for the following:
A square can be thought of as a special rectangle.
 
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Investigate:
Use strips and fasteners to make a triangle and a quadrilateral.
Try to push inward at any one vertex of the triangle. Do the same to the quadrilateral.
Is the triangle distorted? Is the quadrilateral distorted? Is the triangle rigid?
Why is it that structures like electric towers make use of triangular shapes and not quadrilaterals?
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In the figure, the midpoints of the diagonals of a rhombus are joined to form a small quadrilateral:

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Prove that this quadrilateral is a rhombus.

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A quadrilateral in which diagonals are not equal but bisect each other at 90° is called _____.