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# Unit 4 Vocab

TermDefinition
angle The union of two rays with a common endpoint
ray A part of a line consisting of an endpoint and all points on one side of that endpoint
complementary angles Two angles that have a sum of 90 degrees
supplementary angles Two angles that have a sum of 180 degrees
congruent Having the same shape and size
transversal A line that intersects two or more lines at different points
alternate exterior angles Angles that are outside the parallels and on opposite sides of the transversal
alternate interior angles Angles that are inside the parallels and on opposite sides of the transversal
corresponding angles Angles that are in the same (relative) spot
vertical angles A pair of angles formed by two intersecting lines
exterior angle of a triangle The angle formed by extending a side of a triangle
remote interior angle The nonadjacent angles across from an exterior angle of a triangle
transformation A change in the position or size of a figure on a plane
preimage The original image in a transformation
image The position of a figure after a transformation
translation A transformation that slides each point of a figure the same distance in the same direction
reflection A transformation in which a figure is flipped over a line of reflection
rotation A transformation in which each point of the pre-image turns around the center of rotation
similar figures Figures in which the lengths of the corresponding sides are proportional and corresponding angles are congruent
proportion An equation stating that two ratios are equal
scale factor The ratio of the lengths of any pair of corresponding sides or edges in similar figures
dilation Transforming a figure bigger or smaller
hypotenuse The side of a right triangle that is opposite the right angle
legs In a right triangle, the sides that form the right angle
Pythagorean Theorem a^2 + b^2 = c^2
surface area The sum of the areas of the faces of a 3d figure
lateral area The sum of the areas of the lateral (side) face of a 3d figure
Created by: laughlins