Unit 1 Test Vocab Flashcards
a radius r with center 0 is the set of all points that are a distance r units from 0
circle
a set of points on a line with two end points
line segment
a segment that goes through the midpoint
perpendicular bisector
a reasonable guess that you are trying to either prove or disprove
conjecture
a polygon is inscribed if it fits inside the circle and every vertex of the polygon is on the circle.
inscribed
a line through the vertex of an angle that divides it into two equal angles.
angle bisector
a polygon where all of the sides are congruent and all the angles are congruent
regular polygon
an arrangement of figures that covers the entire plane without gaps or overlaps
tessellation
a statement that you think is true but have not yet proved
assertion
if there is a sequence of translations, rotations, and reflections that takes the first figure onto the second
congruent
if a transformation takes A to A’ then A is the original and A’ is the image
image
a translation, rotation, or reflection
rigid transformation
a statement that has been proved mathmatically
theorem
takes a point to another point that is the same distance from the given line
reflection
a line of symmetry for a figure is a line such that reflection across the line takes the figure onto itself
line of symmetry
a figure has reflection symmetry if there is a reflection that takes the figure to itself
reflection symmetry
a figure has symmetry if there is a rigid transformation which takes it onto itself
symmetry
a figure has rotation symmetry if there is a rotation that takes the figure onto itself
rotation symmetry
vertical angles are congruent
theorem
the three angle measures of any triangle always sum to 180 degrees
triangle angle sum theorem
if two parallel lines are cut by a transversal, then alternate interior angles are congruent
alternate interior angle theorem
if two parallel lines are cut by a transversal, then corresponding angles are congruent
corresponding angle theorem
