Math Vocabulary Flashcards by Ethan Hurwich

Q

Point

A

The exact location

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Q

Line Segment

A

A part of a line

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Q

Ray

A

Line that extends forever

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Q

Line

A

Dots connecting 2 points

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Q

Plane

A

Flat line that extends forever

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Q

Congruent

A

Same size, same shape

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Q

Acute Angle

A

An angle that is below 90 degrees

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Q

Right Angle

A

Angle that is equal to 90 degrees

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Q

Obtuse Angle

A

Angle that is more than 90 degrees

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Q

Straight Angle

A

Angle that is equal to 180 degrees

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Q

Reflex Angle

A

An angle that is more than 180 degrees

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Q

Complementary Angles

A

2 angles that add up to 90 degrees

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Q

Supplementary Angles

A

2 angles that add up to 180 degrees

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Q

Perpendicular lines

A

2 lines that intersect at a 90 degree angle

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Q

Parallel lines

A

2 lines that will never touch

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Q

Skew lines

A

2 different planes with angles that do not intersect but are not parallel

Q

Adjacent Angles

A

2 angles right next to eachother

Q

Vertical Angles

A

2 angles across from another

Q

Triangle

A

A polygon with 3 sides

Q

Quadrilateral

A

Polygon with 4 sides

Q

Pentagon

A

Polygon with 5 sides

Q

Hexagon

A

Polygon with 6 sides

Q

Septagon/Heptagon

A

Polygon with 7 sides

Q

Octagon

A

Polygon with 8 sides

Nonagon

Polygon with 9 sides

Decagon

Polygon with 10 sides

Scalene

No equal sides

Isosceles

At least 2 congruent sides

Equilateral

All sides congruent

Acute Triangle

All angles are acute

Obtuse Triangle

1 side is obtuse

Right Triangle

1 right angle

Parallelogram

Opposite sides are parallel and congruent

Rectangle

Parallelogram with right angles

Rhombus

Parallelogram with 4 congruent sides

Square

Parallelogram with 4 congruent sides and 4 right angles

Trapezoid

Exactly 1 pair of opposite sides are parallel

Triangle Sum Rule

All angles of a triangle add up to 180 degrees

Diagonal

Line segment connects 2 verticies