hey there it's Kalei in this lesson we will learn how to classify and identify
the parts of solid figures so far we have learned about two dimensional
shapes like triangles and parallelograms we call these types of shapes plain
figures because they lie in one plane and have no depth in this lesson we will
work with three-dimensional shapes we also called these shapes solid figures
because they do have depth we're going to learn how to name these 3d shapes and
their parts the first solid figure we are going to talk about is a prism a
prism is a figure that has two parallel congruent faces and flat sides the basis
can be any polygon one example of a prism you probably know is a cube you
can see the top in the bottom of the cube are parallel and congruent squares
but since a prism can have bases of any polygon we can also have triangular
prisms like this one see how both faces are parallel and congruent triangles
what shape do you see on the sides yes those ones are rectangles we also have
solid figures called cylinders cylinders have faces that are circles a rectangle
is wrapped around the edges of the bases to form the center can you think of a
time in your life you've seen a cylinder yeah like a soup can
those are cylinders next we have pyramids pyramids have a polygon base
and triangle sides that meet at a point here we have a hexagonal pyramid so the
base is a six-sided polygon and the sides are all triangles
meet at a point but when you hear the word pyramid you might think about the
Egyptian pyramids those are square pyramids so instead of a six-sided base
they have a four-sided base now we have a cone a cone is a circular base and its
sides are smooth and meet at one point notice that the sides of a cone are made
up of one piece like a cylinder what does this shape remind you of maybe like
eating an ice cream cone the last solid figure we're going to
talk about is the sphere a sphere is a collection of points that are the same
distance to a center point that forms a circular shape you're probably familiar
with spheres if you've ever kicked a soccer ball or dribble the basketball
those balls are spheres now we're going to learn about the parts of solid figure
faced edge and vertex the face on a solid figure is any flat surface a solid
figure can have more than one like this pentagonal prism it has five sides and
two bases so altogether seven faces but this sphere has no flat surfaces so it
has zero faces an edge is the line segment where two faces meet notice
where the base of this prism meets the meets the face is a line that is what
the edge is this triangular prism has nine edges but look at this cone it only
has one face the circular base but since it only has one face there are zero
edges a vertex is where the end of an edge meets the end of another edge and
forms a corner on this cube we can see where the edges meet to form the corners
a cube has 8 vertices since this cylinder has no edges that
meet at a point it has 0 vertices nice work
you've classified the parts and the types of solid figures you can practice
what you've learned by doing the online games and quizzes have fun and remember
to always be clever