Question | Answer |
perfect square | rational numbers whose square roots are whole numbers |
square root | one of the two factors of a number |
radical sign | the symbol used to indicate a non negative square root |
real numbers | the set of rational numbers together with the set of irrational numbers |
irrational numbers | a number that cannot be expressed as a over b where a and b are intergers and b does not equal zero |
point | a specific location in space with no size or shape |
ray | a part of a line that extends indefinitely in one direction |
line | a never ending straight path |
angle | two rays with a common end point |
vertex | the common end point of the rays froming an angle |
sides | two rays that make up an angle |
degree | the most common unit of measure for angles |
protractor | an instrument used to measure angles |
acute angle | an angle that measures less than 90 degrees |
right angle | an angle that measures 90 degrees |
obtuse angle | an angle with the measure greater than 90 degrees |
straight angle | an angle with a measure equal to 180 degrees |
line segment | part of a line containing two end points and all points between them |
triangle | a polygon having three sides |
acute triangle | a triangle that all angles are less than 90 degrees |
obtuse triangle | a triangle with one angle over 90 degrees |
right triangle | a triangle with one 90 degree angle |
congruent | line segments that have the same length, or angles that have the same measure |
scalene triangle | a triangle with no congruent sides |
isosceles triangle | a triangle that has at least two congruent sides |
equilateral triangle | a triangle with all sides congruent |
legs | the sides that are adjacent to the right angle of a right triangle |
hypotenuse | the side opposite the right angle in a right triangle |
pythagoream theorem | if a triangle is a right triangle, then the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs |