Geometry Ch. 1 Flashcards
point
represented with a dot on a paper, a point is an exact location in space which has no dimensions
line
straight, 1-dimensional breadth with no end
*two points determine a line
line segment
part of a line bounded by two endpoints
plane
3-dimensional flat surface that has no end
*three noncollinear points determine a plane
collinear
points contained in the same line
coplanar
points contained within the same plane
concurrent
lines that share the same point
ray
part of a line that extends endlessly in one direction
angle
a pair of rays that have the same endpoint
protractor
a tool used to measure angles
compass
a tool used to draw circles
polygon
a closed 2-dimensional shape made up of straight line segments
polyhedron
a closed 3-dimensional shape made up of straight line segments
quadrilateral
a closed 2-dimensional shape made up of only 4 straight line segments
pentagon
a closed 2-dimensional shape made up of 5 straight line segments
hexagon
a closed 2-dimensional shape made up of 6 straight line segments
octagon
a closed 2-dimensional shape made up of 8 straight line segments
radius
the distance from the center of the circle to its edge
diameter
the distance from one side of the circle to the other through its center
bisect
to cut into two equal parts
perimeter
the total distance around a polygon
vertex
the shared endpoint of the rays of an angle
Area of a quadrilateral with right angles
A = L x W
face
one plane of a polyhedron
