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Pre-Algebra Chapter 9 Vocab
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9.1 Squares and Square Roots, 9.2 The Real Number System, 9.3 Angles, 9.4 Triangles, 9.5 The Pythagorean Theorem, 9.6 The Distance and Midpoint Formulas, 9.7 Similar Figures (I would recommend doing matching)
Terms in this set (37)
perfect squares
rational numbers whose square roots are whole numbers ex: 3,9,16
square root
one of two equal factors of a number ex: square root of 4 is 2 since 2x2=4
radical sign
used to indicate the square root
irrational numbers
not repeating or terminating decimals, cannot be written in fraction form
real numbers
rational and irrational numbers together
rational number
can be written in fractional form
integer
a positive or negative whole number ex: -4, 9, 1
whole number
postive integers 0 to infinity
natural number
postivie integer 1 to infinity
point
specific location in space with no size of shape
ray
a part of a line that extends indefinitely in one direction
line
never ending straight path
angle
two rays that have the same endpoint
vertex
the common endpoint of the angle
degree
the most common unit for measurement of angles
protractor
used to measure angles
acute angle
measures more than 0 degrees, but less than 90 degrees
obtuse angle
measures more than 90 degrees, but less than 180 degrees
straight angle
measures exactly 180 degrees
right angle
measures exactly 90 degrees
line segment
part of a line containing two endpoints and all of the points between them
triangle
figure formed with 3 lin segments that intersect only at their endpoints
acute triangle
all angles less than 90 degrees
right triangle
one angle equals 90 degrees
obtuse triangle
one angle greater than 90 degrees
congruent
angles or sides that are equal
scalene triangle
no equal sides
isosceles triangle
two sides equal
equilateral triangle
all sides equal
Pythagorean Theorem
describes the relationship between lengths of the legs and the hypotenuse; only in right triangles
legs
sides that are adjacent to the right angle
hypotenuse
the side opposite the right angle and the biggest side
converse
the statement formed by reversing the phrase after if and then in an if-then statement
distance formula
used to find the distance between two points
midpoint formula
used to find the coordinates of the midpoint of a segment
similar triangles
triangles that have the same shape but not necessarily the same size
indirect measurement
using properties of similar triangles to find measurements that are difficult to measure directly
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