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44 terms


math vocab words for classes with quiz or tests(Mrs. Smothers)
a location in space that has no size
series of points that extends in opposite directions without end
flat serface with many lines and extends without end in many directions
part of a line with 2 end points
part of line with one end point
Parallel Lines
lines in the same plane that never intersect
Skew Lines
lines that lie in different planes they are neither parallel or intersecting
Adjacent Angles
two angles that share a common vertex and side, but have no common interior points
Vertical Angles
A pair of opposite congruent angles formed by intersecting lines
Congruent Angles
Angles that have the same measure
Supplementary Angles
Two angles whose sum is 180 degrees
Complementary Angles
Two angles whose sum is 90 degrees
a line that intersects two or more lines in a plane at different points
Corresponding Angles
lie on the same side of the transversal and in corresponding positions
Alternate interior Angles
angles between 2 lines and on opposite sides of a transversal
a closed plane figure formed by three or more line segments
Regular polygon
a polygon with all sides and all angles Congruent
Congruent Figures
Two figures that have the same shape and size the coresponding sides and angles are congruent
set of all points in a plane that are the same distance from a given point
Central Angle
an angle whose vertex is the center of the circle
Perpendicular lines
two lines that intersect to form right angles
Segment Bisector
a segment, ray, line, or plane that intersects a segment at its midpoint
Angle Bisector
a ray that divides an angle into two congruent angles
a transformation that moves points the same distance and in the same direction
The figure after transformation
Reflectional symmetry
when one half is a mirror image of the other half
Line of symmetry
Divides a figure with reflectional symmetry into two congruent halves
Transformation that flips a figure over
Line of reflection
reflected figure or image is congruent to original figure
Transformation that turns a figure around a fixed point called Center of Rotation.
Center of Rotation
Fixed point
Rotational symmetry
You can rotate it 180 degrees or less
Acute triangle
3 acute angles
Right triangle
1 right angle
Obtuse triangle
1 obtuse angle
Equilateral triangle
3 congruent sides
Isosceles triangle
2 congruent sides
Scalene triangle
No congruent sides
4 sides
4 90 degree angles and 4 congruent sides
4 90 degree angles
4 congruent sides
The distance around a circle
A chord that passes through the center of a circle