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geometry irl
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Geometry irl
Angle
An angle is two rays with and end point.
Angles
An example of an angle that you see every day is a doorway.
Ray
A ray is a line that extends forever in one direction.
what is a ray?
a ray that you have probably seen before would be a light ray from a flash light or lazer pointer
the letter "x" on this exit sign has an exaple of an acute angle and and obtuse angle
acute & obtuse angles
an obtuse angle
this is an acute angle
this window has a examples of a few different types of angles
straight angles measure 180°
some more angles
a right angle is an angle measuring 90°
these two right angles share a vertex and are adjacent to eachother
Triangles
a triangle is a shape that has 3 sides and 3 angles
an equilateral triangle has all of its sides the same length like this
an isosceles triangle has two equal sides
Triangles
this is a scalene triangle because all 3 of its sides are different lengths
Triangles can also be defined by their angle.
an acute triangle that has 3 acute angle
Triangles based on angles.
a right triangle is a triangle with a right angle
an equilateral triangle is also an acute triangle because all 3 of its angles are less than 90°
Polygons
- polygons are closed two dimensional shapes made of straight lines
you can find polygons on the road, in street signs
polygons
this rectangle is also a polygon
a regular polygon is a polygon with all sides equal lengths
this polygon is a octagon a two dimensional shape closed with 8 sides.
triangles are polygons.
you can also see geometrical lines on the road.
these street lines are parallel to each other. they run along side but never touch
lines in geometry
perpendicular lines are lines that intersect like this