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4. Basic Geometrical Ideas
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Q2 of 27 Page 82

Draw a rough sketch of a quadrilateral KLMN. State “

(a) two pairs of opposite sides,


(b) two pairs of opposite angles,


(c) two pairs of adjacent sides,


(d) two pairs of adjacent angles.

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(a) KL and NM,


KN and LM


(b) ∠KLM and ∠KNM


∠NKL and ∠NML


(c) NK, NM and LK, LM


KL, KN and MN, ML


(d) ∠N, ∠K and ∠L , ∠M


∠N, ∠M and ∠K, ∠L


More from this chapter

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2

Which two triangles have ∠B as common?

1

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?

3

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?

1

From the figure, identify:


(a) the centre of the circle


(b) three radii


(c) a diameter


(d) a chord


(e) two-points in the interior


(f) a point in the exterior


(g) a sector


(h) a segment

Questions · 27
4. Basic Geometrical Ideas
1 2 3 4 5 6 1 2 3 4 5 1 2 3 1 2 2 2 2 1 2 3 1 2 2 3 4
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