Geometry in the Real World • Clay Hearrean • Block 2 • December 11, 2009
Geometry in the Real World
• Clay Hearrean• Block 2• December 11, 2009
Point
• Exact position or location on a plane surface.
• The middle of the home plate is a point.
Line (Segment)
• A line with definite endpoints.
• In football, receivers try to stay in bounds- the boundaries are a line segment.
Plane
• An imaginary flat surface that is infinitely large and with zero thickness.
• The bowling alley is a flat surface.
Angle
• A shape formed by two lines or rays diverging from a common point (the vertex).
• The field goal makes 2 90 degree angles.
Perpendicular Lines
• A line is perpendicular to another if it meets or crosses it at right angles (90 degrees).
• The net makes perpendicular lines with the service boxes.
Parallel Lines
• Lines are parallel if they lie in the same plane and are the same distant apart over their entire length.
• Each yard line of a football field is parallel with the previous or next yard line.
Triangle
• A closed figure consisting of three line segments linked end to end, 3 sided polygon.
• A baseball diamond’s infield cut in half is a triangle.
Right Triangle
• A triangle where one of its interior angles is a right angle (90 degrees).
• The 10 area of the shuffle board cut in half is 2 right triangles.
Pentagon
• A polygon with 5 sides.
• Most soccer balls have pentagons on them.
Hexagon
• A polygon with 6 sides.
• MMA fighters fight in hexagon rings.
Square
• A 4-sided regular polygon with all sides equal and all internal angles 90 degrees.
• 1st base is a square.
Rectangle
• A 4-sided polygon where all interior angles are 90 degrees.
• A football field is a rectangle.
Trapezoid
• A quadrilateral which has at least one pair of parallel sides.
• In an Oklahoma drill 2 trapezoidal pads are used as boundaries.
Parallelogram
• A quadrilateral with both pairs of opposite sides parallel and equal in length.
• This guitar’s frets have parallelograms on them.
Circle
• A line forming a closed loop, every point on which is a fixed distance from a center point.
• In hockey arenas, center ice is a circle.
Cylinder
• A solid with circular ends and straight sides (like a pipe).
• The sweet spot of a baseball bat has the shape of a cylinder.
Sphere
• A 3-dimensional object shaped like a ball. Every point on the surface is the same distance from the center.
• A golf ball is a sphere.
Octagon
• A polygon with 8 sides.
• UFC fighters fight in octagon cages.
Oval
• An oval or ovoid is any curve that looks like an egg or an ellipse. It is not a precise term and there are many curves that get called "oval".
• A NASCAR track is an oval.
Isosceles Triangle
• A triangle which has 2 of its sides equal in length.
• A dartboard has many isosceles triangles.