Download Geometry Unit

Geometry Unit
Identify the following shapes
Important Definitions
O Parallelogram: a four sided plane with
opposite parallel sides.
O Trapezoid: a quadrilateral with only
one pair of sides that are parallel.
More definitions
O Square: a quadrilateral with all four sides
equal and parallel and four right angles
O Rectangle: a quadrilateral with four right
angles, and opposite sides are equal.
Think about it……..
O Are all squares rectangles???
O All squares are rectangles but all
rectangles are not all squares.......
Rhombus or Kite??
O What is the difference in a Rhombus and a
kite?
Although a rhombus is a type of parallelogram,
whereas a kite is not, they are similar in that
their sides have important properties. Recall
that all four sides of a rhombus are
congruent. Kites, on the other hand, have
exactly two pairs of consecutive sides that are
congruent.
Rhombus or Kite??
A few more definitions …..
O Quadrilateral: A polygon with
four sides.
O Polygon: a figure that has 3
or more sides that are
straight and the figure is
closed…..
All about Triangles…..
O Triangle is a polygon with three sides.
O There are different types of triangles.
We also name triangles by their angle
and side lengths…..
Naming a triangle by angle….
O Obtuse Triangles: have a least one obtuse
angle……..
(obtuse is bigger than 90 degrees)
Naming a triangle by angle …
O Acute triangle: An acute triangle has 3 acute
angles.
Naming triangles by angle
O Right Triangle has one angle is exactly 90
degrees.
Naming triangles by side
lengths
O Equilateral- all sides are equal
O Isosceles triangle- two sides are equal
O Scalene triangle- all sides are different
Practice naming Triangles
O Naming Triangles by angles and sides is also
known as classifying triangles
Click here for practice
Goals for upcoming test
O Find the area of all shapes
O Find the volume of all 3D shapes
O Find the surface area of all 3D shapes
Area
O Area is how much space is
in a 2D shape….so like
filling in a shape or
coloring it in.
Area
Click here for practice
Decomposing shapes
1. On your paper Draw a
rectangle
2. Draw a diagonal line dividing the
rectangle in half.
What two shapes make up the rectangle??
Decomposing shapes
1. Draw a parallelogram on your
paper
2. Draw a diagonal line
dividing up your
parallelogram
What shapes make up a
parallelogram??
Area of Triangles
Since Triangles are half of parallelograms, squares, and rectangles use that
knowledge and see if you can find the area of the triangle below:
Try this one…..
Area of a Triangle
Click here for practice with area of triangle