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### 23 Cards in this Set

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• 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 n-gon) 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