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Chapter 4 Math
Defenitions
Question | Answer |
---|---|
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 |