Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
33 Cards in this Set
- Front
- Back
|
line
|
straight path of points that goes
on forever in two directions |
|
|
ray
|
part of a line, with one end point,
extending forever in only one direction |
|
|
line
segment |
part of a line with two endpoints
|
|
|
congruent
line segments |
line segments that are the same length
|
|
|
plane
|
a flat surface that extends
forever in all directions |
|
|
perpendicular
lines |
intersecting lines that form a right angle
|
|
|
vertex
|
two different rays have the same endpoint
|
|
|
straight
angle |
exactly 180 degrees
|
|
|
vertical
angles |
a pair of angles that are formed by intersecting lines
and have no side in common |
|
|
congruent
angles |
have the same measure;
vertical angles are congruent angles |
|
|
adjacent
angles |
a pair of angles with a common vertex
and a common side |
|
|
complementary
angles |
two angles whose measures
add up to 90 degrees |
|
|
supplementary
angles |
two angles whose measures
add up to 180 degrees |
|
|
acute
triangle |
all angles are acute
(less than 90 degrees) angles |
|
|
right
triangle |
one angle is a right (90 degree) angle
|
|
|
obtuse
triangle |
one angle is an obtuse
(greater than 90 degree) angle |
|
|
equilateral
triangle |
all sides are congruent (the same size)
|
|
|
isosceles
triangle |
at least two sides are
congruent (the same size) |
|
|
scalene
triangle |
NO sides are congruent (the same size)
|
|
|
trapezoid
|
a quadrilateral with only
one pair of parallel sides |
|
|
parallelogram
|
a quadrilateral with both pairs
of opposite sides parallel; a rectangle and rhombus are parallelograms |
|
|
rhombus
|
a parallelogram with all sides congruent
|
|
|
rectangle
|
a parallelogram with four right angles
|
|
|
square
|
a rectangle with all sides congruent;
a square is also a rhombus |
|
|
circle
|
a closed plane figure made up of all points the same distance from a point called the center; named by its center
|
|
|
radius
|
any line segment that connects
the center to a point on the circle |
|
|
diameter
|
any line segment through the center
that connects two points on the circle |
|
|
chord
|
any line segment that connects
two points on the circle; a diameter is also a chord |
|
|
arc
|
part of a circle connecting
two points on the circle |
|
|
central
angle |
an angle whose vertex is
the center of the circle |
|
|
sector
|
a region bounded by two radi and an arc
|
|
|
semicircle
|
an arc that connects the
endpoints of a diameter |
|
|
center
|
the middle point of a circle;
it is the same distance from all points on the circumference |
