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23 Cards in this Set
 Front
 Back
What are the levels of the van Hiele Theory?

0 recognition
1 analysis 2 relationships 3 deduction 4 axiomtics 

perpendicular

two line segments that form a right angle


parallelogram

a quadrilateral that has two pairs of parallel sides


rhombus

a type of quad. with four sides of the same length


trapezoid

a quad with only one pair of parallel sides


isoceles trapezoid

a trapezoid with one pair of parallel sides that are congruent


line of (axis) symmetry

similar to a "fold line". (if you were to fols a triangle in half down the middle it would have a line of symmetry).


line of (axis) symmetry

similar to a "fold line". (if you were to fold a triangle in half down the center it would have a line of symmetry).


rotation symmetry

a figure has rotation symmetry if there is a point around which the figure can be rotated less than a full turn, so that the image matches the rotated figure perfectly. (ex: a hexagon)


regular polygon (or ngon)

all sides and angles are congruent


vertex (or interior) angle

formed by two consecutive sides


reflex angle

greater than 180°


supplementary angles

if two angles add to 180°, they are supplementary


complementary angles

if two angles add to 90°, they are complementary


transversal

if two lines, m and l are intersected by a third line, t, it is called a transversal


alternate interior angles (AIA)

in a transversal, they are the angles that are opposite of eachother on the "inside"


acute triangle

a triangle with three angles less that 90°


equilateral figure

a figure with all sides the same length


equilateral triangle

a triangle with three congruent sides


kite

a quad. with two pairs of congruent sides that are adjacent


isoceles triangle

a triangle with at least two congruent sides


obtuse triangle

a triangle with one obtuse angle (greater that 90°)


scalene triangle

a triangle with three unequal sides
