Line A straight path that goes on forever in both directions; it is named by any two points on the...
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Transcript of Line A straight path that goes on forever in both directions; it is named by any two points on the...
Line
A straight path that goes on forever in both directions; it is named by any two points on the line.
Z Y
ZY or YZ
Line Segment
A piece of a line with two endpoints; it is named by
its endpoints
AB
AB or BA
RayA piece of a line with one endpoint and continues forever in the other direction; it’s named by its endpoint and another point on the ray
R T RT
Parallel
Lines, segments, or rays that are always the same
distance apart and NEVER intersect
Intersecting
Lines, segments, or rays that cross each
other
Perpendicular
Lines, segments, or rays that intersect at
900 (right) angles
Skew
Lines, segments, rays that will never intersect because they are in
different planes (THINK…car on the bridge compared to a boat on the
water)
Angle
Two rays that share the same endpoint;
measured in degrees (from 0 to 3600)
KJ
M J
KJM
MJK
How to name this angle:
Vertex
The point where 2 rays meet to form an angle
VertexY
Q N
Interior Point
A point that lies inside the two rays of an
angleC
Exterior Point
A point that lies outside the two rays
of an angle
B
Congruent
Objects that are exactly the same shape and size. When 2 shapes are exactly the same, then their parts (sides, angles, etc.) are the same.
A
B
C
X
Y
Z
These triangles are congruent!
How Many Degrees in a Triangle?
The three angles in a triangle add up to 1800.
So… if angle A is 900, and angle B is 300, then angle C will be 1800-900-300 = 600
A
C
B
How Many Degrees in a Quadrilateral?
The four angles in any quadrilateral add up to
3600.Examples of quadrilaterals:
Circle
A flat, closed curve where every point on the edge is
the same distance from the center
center
Radius
A straight segment drawn from the center of a circle to a point on the outside edge; half the diameter
**There are an infinite # of radii in a circle!
Diameter
A straight segment drawn from one side of a circle to
another THROUGH the center;
twice the radius**There are an infinite # of diameters in a circle!
Circumference
The distance around the edge of a circle found by
multiplying Pi (or Π) by the diameter
C = Π x d
Pi (or Π)
Ratio of the circumference of a circle to the diameter;
Every circle’s circumference divided by
its diameter is Π
Approximately 3.14
PrismA 3-D shape with 2 congruent
bases; all other faces are rectangles
Prisms are named by the shape of their bases
Triangular prism Square prism
Pyramid
A 3-D shape with one base and 3 or more triangular
sides that meet at a vertex; pyramids are named by
their base
Square base, so this
is a square pyramid