Unit 3 math
vocabulary
Definitions and examples by
Tatum
Acute angle
 An
acute angle is a positive angle that
measures less than 90 degrees.
Adjacent angle
 An
adjacent angle is a positive angle that
measures less than 90 degrees.
Isosceles triangle
 An
isosceles triangle is a triangle with at
least two equal sides.
Congruent
 Something
that is congruent are shapes
or angles are congruent if you could put
one on top of the other, and they would
look like just one shape. Equal.
Radius
 Radius
is the distance from the center to a
point on a circle. The line segment from
the center to a point on a circle.
Right angle
A
right angle is an angle whose measure
is 90 degrees.
Reflex angle
A
reflex angle is an angle that is more that
180 degrees and less that 360 degrees.
Scalene triangle
A
scalene triangle is a triangle with three
unequal sides.
Quadrangle
A
quadrangle is a polygon with four sides.
Tessellation
A
pattern that tessellates is basically, a
tessellation is a way to tile a floor (that
goes on forever) with shapes so that there
is no overlapping and no gaps.
Obtuse angle
 An
obtuse angle is an angle whose
measure is greater than 90 degrees.
Opposite angle
A
Opposite angle is when two lines
intersect, four angles are formed. The
angles that are directly opposite to each
other are called Opposite Angles.
Polygon
A
polygon is the union of several line
segments that are joined together so as to
completely enclose an area.
Parallel lines
A
parallel line is two lines that are in the
same plane and never intersect.
Straight angle
A
straight angle is an angle that measures
180 degrees.
Equilateral triangle
 An
equilateral triangle is a triangle that
has three equal sides.
Regular polygon
A
regular polygon is a polygon in which
all the angles are equal and all of the
sides are equal.
Diameter
 Diameter
is the line segment joining two
points on a circle and passing through the
center.