Done By; Lim Ren Yong, Jewels I-3

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Presentation transcript:

Done By; Lim Ren Yong, Jewels I-3 Quadrilaterals Done By; Lim Ren Yong, Jewels I-3

Quadrilaterals Any four-sided shape is a Quadrilateral. But the sides have to be straight, and it has to be 2-dimensional. Quadrilateral just means "four sides“(quad means four, lateral means side).

~Properties~ Four sides (or edges) Four vertex (or corners). The interior angles add up to 360 degrees All angles should add up to 360 degrees

Types of Quadrilaterals There are special types of quadrilateral: -Square -Kite -Parallelogram -Rectangle -Rhombus -Trapezium Some types are also included in the definition of other types. For example a square, rhombus and rectangle are also parallelograms

Rectangles A rectangle is a four-sided shape where every angle is a right angle (90°). Also opposite sides are parallel and of equal length.   -The square represents the right angle -The lines shows the equal sides of the rectangle

-Rhombus- A Rhombus is a four-sided shape where all sides have equal length. Also opposite sides are parallel and opposite angles are equal. Another interesting thing is that the diagonals (dashed lines in second figure) of a rhombus bisect each other at right angles.

Square -The small square represents the right angle A square has equal sides and every angle is a right angle (90°) Also opposite sides are parallel. A square also fits the definition of a rectangle (all angles are 90°), and a rhombus (all sides are equal length). -The small square represents the right angle -The lines shows the equal sides of the rectangle

NOTE: Squares, Rectangles and Rhombuses are all Parallelograms! Opposite sides are parallel and equal in length, and opposite angles are equal (angles "a" are the same, and angles "b" are the same) Example; A parallelogram with: -All sides equal -Angles "a" and "b" as right angles is a square

A trapezium has one pair of opposite sides parallel. -It is called an Isosceles trapezium if the sides that aren't parallel are equal in length and both angles coming from a parallel side are equal, as shown. A trapezium has one pair of opposite sides parallel.

Kite The small square represents the right angle The kite has two pairs of sides. Each pair is made up of sides that are equal in length. The angles are equal where the pairs meet. Diagonals (the dashed lines) meet at a right angle, and one of the diagonal bisects (cuts equally in half) the other.   The small square represents the right angle The lines shows the equal sides of the kite

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