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# 7th: PSSA Vocabulary

### Use the flashcards to review important math vocabulary.

Acute triangle A triangle that has each angle measuring less than 90 degrees.
Coordinate plane 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 Points on a coordinate plane. (x,y)
Origin The point at which the two axes intersect has the coordinates (0,0).
Corresponding angles 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.
Isosceles triangle A triangle that has exactly two congruent sides.
Linear function An equation whose graph in a coordinate plane is a straight line.
Obtuse triangle A triangle with one angle that measures more than 90ยบ.
Order of operations Rules describing what sequence to use in evaluating expressions; also known as PEMDAS
Prism A three-dimensional solid that has two congruent and parallel faces that are polygons. The remaining faces are rectangles.
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.
Scalene triangle A triangle with no congruent sides.
Scatterplot A graph with points plotted to show a relationship between two variables.
Stem-and-leaf plot A data display that shows groups of data arranged by place value.
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.
Parallel lines Two or more lines that will never intersect.
Perpendicular lines Two or more lines that intersect forming a right angle.
Similar Figures Two figures that are the same shape, but not necessarily the same size. Their corresponding side lengths have equal ratios.
Congruent Means the same.
Created by: tsuprick