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parallel lines Two lines on a plane that never meet. They are always the same distance apart.
Pi The ratio of a circle's circumference to its diameter; Equal to 3.14159265358979323846... (the digits go on forever without repeating) A rough approximation is 22/7 , but that is not very accurate
pre-image The original figure prior to a transformation
Pythagorean triple set of positive integers, a, b and c that fits the rule: a squared + b squared = c squared
PythagoreanTheorem In a right angled triangle the square of the hypotenuse is equal to the sum of the squares of the other two sides. It is stated in this formula: a squared + b squared = c squared.
Radius the distance between the center and any point on a circle
A’ “A prime”
reflection A transformation that reflects a figure in a line; also known as a flip. An image or shape as it would be seen in a mirror
right triangle a triangle with one right angle
rigid transformations also called an isometry; a transformation of the plane that preserves length. Reflections, translations, rotations, and combinations of these three transformations are ____________
rotation A transformation in which a plane figure turns around a fixed center point. In other words, one point on the plane, the center of rotation, is fixed and everything else on the plane rotates about that point by a given angle
scale factor The ratio of any two corresponding lengths in two similar geometric figures.
similarity having the same shape; having corresponding sides proportional and corresponding angles equal
sphere a solid formed by all points in space that are the same distance from a fixed point called the center
supplementary angles two angles whose measures have a sum of 180 degrees
translation a transformation that moves each point of a figure the same distance in the same direction, also called a slide
transversal A line that crosses at least two other lines.
vertical angles a pair of opposite angles formed when when two lines meet at a point
volume The amount of 3-dimensional space an object occupies. Capacity.
Created by: artisteacher