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Word
Definition
Acute
Acute angles measure
between 0º and 90º.
Angle
Angles are the regions of a
plane between two rays
which share a common
origin
Equilateral triangle
An equilateral triangle has
three equal sides and angles
Isosceles triangle
Two equal sides.
Line of symmetry
Symmetry is when one
shape becomes exactly like
another if you flip, slide or
turn it.
The simplest type of
Symmetry is "Reflection"
(or "Mirror") Symmetry, as
shown in this picture of my
dog Flame
Obtuse angle
An obtuse angle is one
which is more than 90° but
less than 180°
In other words, it is
between a right angle and a
straight angle.
Picture
Parallel lines
Two parallel lines do not
intersect at any point.
Parallelogram
A parallelogram is a
quadrilateral that has
parallel sides in pairs.
The sum of the interior
angles of a parallelogram is
equal to 360°
Two lines are perpendicular
when they intersect at 90°
angles or right angles.
Perpendicular lines
Plane figure
A flat figure
Polygon
A plane shape (twodimensional) with straight
sides.
Examples: triangles,
rectangles and pentagons.
(Note: a circle is not a
polygon because it has a
curved side)
Quadrilateral
A quadrilateral is a polygon
with four sides. A
quadrilateral has two
diagonals. The sum of the
interior angles of a
quadrilateral equals 360º
Rectangle
A rectangle has equal
opposite sides and 4 right
angles.
Rhombus
A rhombus has four equal
sides and equal opposite
angles.
Right angle
A right triangle has a right
angle.
Scalene triangle
Three unequal sides.
Side
• the lateral face of a threedimensional solid.
Square
A square has 4 equal sides
and 4 right angles.
Triangle
A triangle is a polygon
determined by three
nonaligned points (vertices)
or three intersecting line
segments (sides).
Trapezoid
The trapezoid or trapezium
is a quadrilateral with two
parallel sides.
Vertex
The vertex is the point of
union between two rays
which form an angle
Line
A line has one dimension,
length, and it is determined
by two points
Intersecting lines
Two lines that meet at a
point are called intersecting
lines.
Similar
two shapes are Similar
when the only difference is
size (and possibly the need
to move, turn or flip one
around).
Congruent angles have the
same measure.
Congruent
Ray
A line with a start point but
no end point (it goes to
infinity)
Line segment
A line segment is a straight
line that joins two points,
called endpoints.
Straight angle
A straight angle measures
exactly 180º
Equilateral triangle
Three equal sides