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# Chapter 4 Math

### Defenitions

triangle a polygon with three sides
scalene No congruent sides
isosceles At least 2 congruent sides
equilateral 3 congruent sides
acute 3 acute angles
right 1 right angle
obtuse 1 obtuse angle
equilangular 3 congruent angles
interior angles The original angles
exterior angles The angles that form linear pairs with the interior angles
corollary to a theorem a statement that can be proved easily using the theorem. The corollary below follows from the Triangle Sum Theorem
congruent figures Two geometric figures are congruent if they have exactly the same size and shape.
corresponding parts all the parts of one figure are congruent to the corresponding parts of the other figure
right triangle 1 right angle
legs In a right triangle, the sides adjacent to the right angle are called the legs
hypotenuse The side opposite the right angle is called the hypotenuse of the right triangle
flow proof A flow proof uses arrows to show the flow of a logical argument
isosceles triangle At least 2 congruent sides
legs When an isosceles triangle has exactly two congruent sides, these two sides are the legs
vertex angle The angle formed by the legs
base The third side is the base of the isosceles triangle.
base angles The two angles adjacent to the base
transformation an operation that moves or changes a geometric figure in some way to produce a new figure.
image The new figure is called the image
congruence transformation A congruence transformation changes the position of the figure without changing its size or shape.
translation A translation moves every point of a figure the same distance in the same direction
reflection A reflection uses a line of reflection to create a mirror image of the original figure
rotation A rotation turns a figure about a fixed point, called the center of rotation
Created by: NuttyBaseball