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math vocab words for classes with quiz or tests(Mrs. Smothers)

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Point

a location in space that has no size

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Line

series of points that extends in opposite directions without end

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Plane

flat serface with many lines and extends without end in many directions

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Segment

part of a line with 2 end points

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Ray

part of line with one end point

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Parallel Lines

lines in the same plane that never intersect

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Skew Lines

lines that lie in different planes they are neither parallel or intersecting

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Adjacent Angles

two angles that share a common vertex and side, but have no common interior points

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Vertical Angles

A pair of opposite congruent angles formed by intersecting lines

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Congruent Angles

Angles that have the same measure

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Supplementary Angles

Two angles whose sum is 180 degrees

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Complementary Angles

Two angles whose sum is 90 degrees

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Transversal

a line that intersects two or more lines in a plane at different points

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Corresponding Angles

lie on the same side of the transversal and in corresponding positions

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Alternate interior Angles

angles between 2 lines and on opposite sides of a transversal

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Polygon

a closed plane figure formed by three or more line segments

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Regular polygon

a polygon with all sides and all angles Congruent

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Congruent Figures

Two figures that have the same shape and size the coresponding sides and angles are congruent

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Circle

set of all points in a plane that are the same distance from a given point

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Central Angle

an angle whose vertex is the center of the circle

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Perpendicular lines

two lines that intersect to form right angles

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Segment Bisector

a segment, ray, line, or plane that intersects a segment at its midpoint

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Angle Bisector

a ray that divides an angle into two congruent angles

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Translation

a transformation that moves points the same distance and in the same direction

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Image

The figure after transformation

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Reflectional symmetry

when one half is a mirror image of the other half

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Line of symmetry

Divides a figure with reflectional symmetry into two congruent halves

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Reflection

Transformation that flips a figure over

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Line of reflection

reflected figure or image is congruent to original figure

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Rotation

Transformation that turns a figure around a fixed point called Center of Rotation.

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Center of Rotation

Fixed point

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Rotational symmetry

You can rotate it 180 degrees or less

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Acute triangle

3 acute angles

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Right triangle

1 right angle

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Obtuse triangle

1 obtuse angle

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Equilateral triangle

3 congruent sides

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Isosceles triangle

2 congruent sides

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Scalene triangle

No congruent sides

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Square

4 90 degree angles and 4 congruent sides

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Rectangle

4 90 degree angles

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Rhombus

4 congruent sides

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Circumference

The distance around a circle

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Diameter

A chord that passes through the center of a circle