Point

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Book: An exact location in a space

My: A dot or mark that shows an exact location (line segment)

Plane

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Book: A flat surface that extends forever

My: An even surface that goes on forever

Line

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Book: A straight path that extends without end in opposite directions

My: A straight line that goes on forever in both directions

Ray

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Book: A part of the line that starts at one endpoint and extends for ever.

My: One side of a line that goes on forever and the other that ends at a point

Line Segment

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Book: A part of a line between two end points

My: A line that has two end points

Congruent

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Book: Having the same size and shape

My: Two objects that have the same size and shape

Angle

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Book: A figure formed by two rays with a common end point called the vertex

My: A figure that has two rays and a vertex

Vertex ( of an angle)

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Book: The common end point of the sides of an angle

My: The point where two lines in an angle meet

Acute Angle

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Book: An angle that measures less than 90˚

My: An angle that is less than 90˚

Right Angle

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Book: An angle that measures 90˚

My: An angle that is 90˚

Obtuse Angle

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Book: An angle whose measure is greater than 90˚ but is less than 180˚

My: An angle less than 180˚ but greater than 90˚

Straight Angle

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Book: An angle that measures 180˚

My: An angle that is 180˚

Adjacent Angles

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Book: Angles in the same plane that are side by side and have a common vertex and a common side

My: Angles that have the same vertex and side

Vertical Angles

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Book: A pair of angles that are formed by two intersecting lines and are not adjacent

My: Two angles that are formed by intersecting lines and are not adjacent

Complementary Angles

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Book: two angles whose measures add to 90˚

My: two angles that add up to 90˚d

Supplementary Angles 

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Book: two angles whose meaures add to 180˚

My: two angles that add up to 180˚

Polygon

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Book: a closed plane figure formed by 3 or more line segments(sides). Each side meets exactaly two other sides, one on each end, in a common endpoint(vertex).

My: a closed plane that has to meet 2 other sies and have a common endpoint on each end

Vertex

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Book: the intersection of two sides of the polygon

My: the intersection of two sides of a polygon

Triangle

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Book: a three-sided polygon

My: a polygon with 3 sides

Quadrilateral

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Book: a four sided polygon 

My: a polygon with 4 sides

Pentagon

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Book: a five sided polygon

My: a polygon with 5 sides

Hexagon

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Book: a six sided polygon

My: a polygon with 6 sides

Heptagon

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Book: a seven sided polygon

My: a polygon with seven sides

Octagon

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Book: a eight sided polygon

My: a polygon with eight sides

Nonagon

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Book: a nine sided polygon

My: a polygon with nine sides

Decagon

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Book: a ten sided polygon

My: a polygon with ten sides

Scalene Triangle

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Book: a triangle with no congruent sides

My: a triangle that does not have any equal sides

Isosceles Triangle

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Book: a triangle with at least two congruent sides

My: a triangle that only has two equal sides

Acute Triangle

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Book: a triangle with all angles measuring less than 90˚

My: a triangle with all acute angles

Obtuse Triangle

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Book: a triangle containing one obutse angle

My: a triangle with only one obtuse angle

Right Triangle

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Book: a triangle containing a right angle

My: a triangle with exactly one right angle

Parallelogram

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Book: a quadrilateral with two pairs of parallel sides

My: a quadrilateral that has opposite sides parallel

Rectangle

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Book: a parallelogram with four right angles

My: a parallelogram that has four 90˚ angles

Rhombus

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Book: a parallelogram with all sides congruent

My: a parallelogram that has all sides congruent

Square

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Book: a rectangle with four congruent sides

My: a parallelogram with four right angles and all sides congruent

Trapezoid

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Book: a quadrilateral with exactaly one pair of parallel sides

My: a quadrilateral with only one pair of parallel sides

Side-side-side Rule

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Book: a rule stating that if tree sides of one triangle are congruent to the three sides of another triangle, then the triangles are congruent

My: a rule that says if all sides are congruent  (3 from one and 3 from another), in a triangle, they  are congruent

Vertex (of a polygon)

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Book: the intersection of two sides of the polygon

My: the intersection of two sides in a polygon