Mr. Rosado's Geometry Vocabulary Midterm Review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| point | simplest figure, no size, "like a dot"; in a coordinate plane, it is an ordered plane (x,y) that can represent a location
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| line | has no thickness, it is a set of all points extending in two directions indefinitely
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| plane | a flat surface extending in 2-D, has no thickness
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| space | set of all points in 3-D
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| coplanar | points or geometric figures in the same plane; "to be on the same plane"
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| collinear | points or geometrical figures on the same line or "straight path"; "to be on the same line"
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| segment | set of all points between two endpoints
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| midpoint | exact center of two endpoints of a segment
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| equidistant | to be the same distance; "equal distance"
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| congruent segments | segments with equal measures or "same length"
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| ray | "part of a line"; has one endpoint and continues in one direction indefinitely
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| angle | two non-collinear rays that share a common endpoint form an angle
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| vertex | the point that two rays share to form an angle
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| opposite rays | two collinear rays that have a common endpoint
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| straight angle | pair of opposite rays; 180°
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| sides of an angle | the two rays that from an angle
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| obtuse angle | angle measure that is > 90°
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| right angle | angle measure that is = 90°
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| acute angle | angle measure that is < 90°
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| segment bisector | a line, ray, or segment that separates a segment into two congruent segments
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| angle bisector | a line, ray, or segment that separates an angle into two congruent angles
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| congruent angles | angles that have the same angle measure
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| adjacent angles | coplanar angles that have a common side and vertex
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| vertical angles | two non-adjacent angles formed by two intersecting lines
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| linear pair | adjacent angles with non-common sides
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| supplementary | two angles with measures adding up to 180°
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| complementary | two angles with measures adding up to 90°
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| perpendicular lines | two lines that intersect to form right angles
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| conjecture | "educated guess"
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| conditional statement | "If ... then" statement
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| hypothesis | "If ..." part of a conditional
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| conclusion | "... then" part of a conditional
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| converse | when you interchange the hypothesis and the conclusion of a conditional
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| postulate | principles that re accepted to be true, "axiom"
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| theorems | statements that are proved using definitions, postulates, and undefined terms using deductive reasoning
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| parallel lines | two lines in a plane that never meet
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| skew lines | two lines that do not intersect and are not in the same plane
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| transversal | a line that intersects two or more lines in a plane
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| polygon | a closed plane figure with segments for sides that only intersect at the endpoints called the vertices
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| triangle | a three-sided polygon; all angles add up to 180°
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| acute triangle | a triangle with all three interior angles acute
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| obtuse triangle | a triangle with only and exactly one interior angle that is obtuse
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| right triangle | a triangle with only and exactly one interior angle that is right
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| equiangular triangle | a triangle with all three interior angles congruent; a triangle with all three angles being 60°
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| scalene triangle | a triangle with all three sides different in length
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| isosceles triangle | a triangle with at least two sides congruent; a triangle with congruent legs, congruent base angles, and the base opposite from the vertex angle
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| equilateral triangle | a triangle with all three sides congruent
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| CPCTC | Corresponding Parts of Congruent Triangles are Congruent
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| median | a segment that connects the vertex of a triangle to the midpoint of the opposite sides
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| altitude | a segment that connects the vertex of a triangle to the line containing the opposite side and forms a right angle to that line
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| angle bisector | a segment that bisects an angle or triangle
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| perpendicular bisector | a line or segment that passes through the midpoint of a side of a triangle and is perpendicular to that side
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| parallelograms | 1. opposite sides are parallel
2. opposite sides are congruent
3. opposite angles are congruent
4. consecutive angels are supplementary
5. diagonals bisect each other
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| rhombus | 1. all four sides are congruent
2. diagonals perpendicular
3. diagonals bisect opposite angles
4. all properties of parallelograms
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| rectangle | 1. all four angles are right angles
2. diagonals are congruent
3. all properties of parallelograms
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| square | 1. all properties of rhombuses
2. all properties of rectangles
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| trapezoid | a quadrilateral with exactly one pair of parallel sides
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| isosceles trapezoid | a trapezoid with both legs congruent
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| midsegment of a trapezoid | a segment connecting the midpoints of the legs of a trapezoid
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