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Geometry Slideshow
POINT• A point is an exact location in space.
• Say “POINT A”
LINE• A line is a straight path of points that
goes on and on in two directions.
• Say “LINE AB” • Write
LINE SEGMENT• A line segment is a part of a line.
It has two endpoints.
• Say “LINE SEGMENT AB” • Write
RAY• A ray is part of a line. It has one
endpoint and continues on and on in only one direction.
• Say “RAY FG” • Write
ANGLE• An angle is formed by two rays
that have the same endpoint. The common endpoint is the vertex.
SAY: • 1)”Angle A” (vertex)• 2) “Angle BAC”• 3)”Angle CAB”
• Write
ANGLE• QUESTION: WHY CAN’T WE CALL THIS
ANGLE CBA or BCA?
• ANSWER: The VERTEX letter must always be in the center when naming angles OR just by itself.
• Write
PARALLEL LINES
• Never intersect (cross)• They are like the sides of a street• Parallel lines will never meet each other, no matter
how much you continue them in either direction.
INTERSECTING LINES
• Pass through the same point
PERPENDICULAR LINES
• Lines that intersect and form 4 right angles.
• The little symbol marked in the corner means “right angle.”
RIGHT ANGLE
•Measures 90 degrees • has a square corner
ACUTE ANGLE
•Measures less than a right angle (90 degrees)
• It’s so cute! (Get it? Tiny? Acutecute?)
OBTUSE ANGLE
•Measures more than a right angle (90 degrees)
•Less than 180 degrees*Tubas are big and so are obtuse angles!
STRAIGHT ANGLE
•Measures 180 degrees
POLYGONS•Closed, flat plane figures
with 3 or more lines segments
•Is a circle a polygon? NO!
TRIANGLE•3 sides, 3 vertices
Right triangle
QUADRILATERAL•4 sides, 4 vertices
Square
Rhombus
Rectangle
Parallelogram
Trapezoid
QUADRILATERAL
Square: all sides are equal
Rhombus:
Slanted square
Rectangle:has 4 right angles, 2 sets of parallel lines
Parallelogram:Slanted rectangle, opposite sides are parallel
Trapezoid:One set of parallel lines, one set of lines that will intersect
PENTAGON• 5 sides, 5 vertices
HEXAGON•6 sides, 6 vertices
HEPTGON•7 sides, 7 vertices
OCTAGON• 8 sides, 8 vertices
NONAGON•9 sides, 9 vertices
DECAGON•10 sides, 10 vertices
3D shapes