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PSSA Vocabulary 7&8

PSSA Vocabulary (Grades 7&8)

Acute triangle A triangle that has each angle measuring less than 90°
Adjacent angles Angles that share a common side and common vertex and do not overlap
Alternate exterior angles A pair of angles located outside a set of parallel lines and on opposite sides of the transversal
Alternate interior angles A pair of angles located between a set of parallel lines and on opposite sides of the transversal
Box-and-whisker plot A graphic method for showing a summary of data using median, quartiles and extremes of data
Complementary angles Two angles whose measures, when added together, equal 90°
Compound event An event made up of two or more simple events
Coordinate plane/graph A two-dimensional system in which the coordinates of a point are its distances from both a horizontal and a vertical line called the axes.
Ordered pairs The first number, called the x-coordinate, designates the distance along the horizontal axis;The second number, called the y-coordinate, designates the distance along the vertical axis
Origin The point at which the two axes intersect has the coordinates (0,0)
Corresponding angles (1) When a transversal intersects two lines, corresponding angles are on the same side of the transversal and on the same side of the given lines
Corresponding angles (2) Angles in the same relative position in similar or congruent figures
Equilateral triangle A triangle whose sides are all the same length
Experimental probability A statement of probability based on the results of a series of trials
Independent events Two events in which the outcome of one event does not affect the outcome of the other event
Isosceles triangle A triangle that has exactly two congruent sides
Linear function An equation whose graph in a coordinate plane is a straight line
Mutually exclusive events Two events that cannot occur at the same time
Net A two-dimensional shape that can be folded to create a three-dimensional figure
Obtuse triangle A triangle with one angle that measures more than 90º
Order of operations Rules describing what sequence to use in evaluating expressions;(1) Perform operations in grouping symbols, (2) Evaluate exponents, (3) Multiply or divide from left to right, (4) Add or subtract from left to right
Perfect square The product of an integer multiplied by itself
Permutation Possible orders, or arrangements of a set of items;Placing these items in a different order results in a new permutation
Prism A three-dimensional solid that has two congruent and parallel faces that are polygons;The remaining faces are rectangles; They are named by their bases
Proportion An equation showing that two ratios are equal
Pythagorean theorem A formula for finding the length of a side of a right triangle when the lengths of two sides are given;(a~squared + b~squared = c~squared)
Scalene triangle A triangle with no congruent sides
Scatterplot A graph with points plotted to show a relationship between two variables
Scientific notation A form of writing very large or very small numbers using a number greater than or equal to 1 and less than 10 multiplied by a power of 10
Stem-and-leaf plot A data display that shows groups of data arranged by place value
Supplementary angles Two angles whose measures, when added together, equal 180°
Surface area The sum of the areas of all of the faces of a three-dimensional figure
Theoretical probability A statement of the probability of an event without doing an experiment or analyzing data;P (event) = number of favorable outcomes divided by number of possible outcomes.
Vertical angles A pair of opposite congruent angles formed when two lines intersect
Created by: pstoughton