1.
GROUP MATHEMATIC
ISOSCELES TRAPEZOID
MEMBER IN GROUP: CLARA RIA D
KARINA RAHMAWATI
MONITA SYAFA’ATI
SEVI MERLINDA
WIDYASTIKA FAURANI
(13)
(18)
(21)
(25)
(26)
2.
QUADRILATERALS
A quadrilateral is a 2-dimensional closed shape with four straight sides. E.g. The
shape ABCD shown here is a quadrilateral.
A line segment drawn from one vertex of a quadrilateral to the opposite vertex is
called a diagonal of the quadrilateral. AC is a diagonal of quadrilateral ABCD, as is
BD.
3.
PROPERTIES OF
QUADRILATERALS
Four sides (or edges)
Four vertices (or corners).
The interior angles add up to 360 degrees:
Try drawing a quadrilateral, and measure the angles. They
should add to 360°
4.
TYPES OF QUADRILATERALS
There are seven types of quadrilaterals that can be divided
into two groups: parallelograms and other quadrilaterals.
5.
RECTANGLES
means "right angle"
and
show equal sides
A rectangle is a four-sided shape where every angle is a right
angle (90°).
Also opposite sides are parallel and of equal length.
And a vast is p×l and the arround is equal to sides
6.
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.
Rectangles, squares and rhombuses (or diamonds) are
parallelograms
7.
SQUARE
means "right angle"
show equal sides
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).
8.
PARALLELOGRAM
sides are parallel and equal in length, and opposite
angles are equal (angles "a" are the same, and angles
"b" are the same)
NOTE: Squares, Rectangles and Rhombuses are all
Parallelograms!
9.
KITE
Two pairs of adjacent sides of a kite are equal in length
One pair of opposite angles (the ones that are between the
sides of unequal length) are equal in size.
One diagonal bisects the other.
Diagonals intersect at right angles.
10.
TRAPEZOID
Trapezoid
Isosceles Trapezoid
A trapezoid (called a trapezium in the UK) has one pair of
opposite sides parallel.
It is called an Isosceles trapezoid if the sides that aren't
parallel are equal in length and both angles coming from a
parallel side are equal, as shown.
Language Note: In the US a "trapezium" is a quadrilateral
with NO parallel sides!
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