The file was prepared for the students taking part in eTwinning project The Gardens Of Maths ( Anna Vasa School, Poland)

1. VOCABULARY
VOCABULARY
POLYGON : A closed plane figure made by line segments.
POLYGON
SIIDES : A line segment forming part of a plane figure.
S DES
TRIIANGLE : A polygon that has 3 sides.
TR ANGLE
SCALENE TRIIANGLE
SCALENE TR ANGLE IISOSCELES
SOSCELES EQUIILATERAL
EQU LATERAL
no sides equal, no TRIIANGLE two sides
TR ANGLE TRIIANGLE all sides
TR ANGLE
angles equal equal, two angles equal, all angles equal
equal
base
RIIGHT:: A triangle that measures exactly 90º.
R GHT
hypotenuse
legs
QUADRIILATERAL : A polygon that has 4 sides.
QUADR LATERAL
SQUARE : A polygon that has four equal sides and four right angles.
SQUARE
str. 1

2. RECTANGLE : A quadrilateral that has four sides and four right angles.
RECTANGLE
PARALLELOGRAM : a quadrilateral that has two pairs of parallel sides.
PARALLELOGRAM
RHOMBUS:: A parallelogram with all four sides equal in length.
RHOMBUS
TRAPEZOIID : A quadrilateral with one pair of parallel sides and one pair of sides that
TRAPEZO D
are not parallel.
IISOSCELES TRAPEZOIID : A trapezoid with two congruent legs
SOSCELES TRAPEZO D
KIITE : A quadrilateral with two pair of adjacent congruent sides
K TE
PENTAGON:: A polygon with five sides
PENTAGON
str. 2

3. HEXAGON : A polygon that has 6 sides.
HEXAGON
OCTAGON : A polygon that has eight sides.
OCTAGON
ANGLES : Two rays with a common endpoint.
ANGLES
OBTUSE : An angle with a measure of greater than 90º and less than 180º.
OBTUSE
ACUTE : An angle with a measure less than 90º.
ACUTE
DIIAGONAL - a line segment connecting two non-adjacent vertices of a polygon
D AGONAL
str. 3

4. PERPENDIICULAR BIISECTOR OF A LIINE SEGMENT : is a line that
PERPEND CULAR B SECTOR OF A L NE SEGMENT
(1) intersects a given segment at a 90° angle, and
(2) passes through the given segment’s midpoint.
SYMMETRIIC : a figure is symmetric if it can be folded into two
SYMMETR C
congruent halves that fit on top of each other
SYMMETRY : A line that divides a figure into two congruent
SYMMETRY
halves that are mirror images of each other.
LIINE OF SYMMETRY : a line that divides a plane figure into two
L NE OF SYMMETRY
parts that are mirror images of each other
ROTATIION SYMMETRY : if you can turn a figure around a point so it coincides with its
ROTAT ON SYMMETRY
original position two or more times during a complete turn
ORDER OF ROTATIION SYMMETRY : the number of times a figure coincides with its
ORDER OF ROTAT ON SYMMETRY
original position during the complete turn
TURN (ROTATIION)): moves a figure about a point
TURN (ROTAT ON
FLIIP : a transformation in which a plane figure is flipped or
FL P
reflected across a line, creating a mirror image of the original
figure
str. 4