Download 1.3 Day 2 – Triangles and Quadrangles

1.3 Day 2 – Triangles and
Quadrangles
Homework Review
In your Math Notebook, define, draw and label
•a point
•a line
•a line segment
•a ray
•an angle
•an obtuse angle
•an acute angle
•a right angle.
Mental Math
Use a straight edge to draw…
What is the value of the digit?
Write your answer on your slate.
What is the value of the 7 in 47?
What is the value of the 2 in 923?
What is the value of the 6 in 6,415?
What is the value of the 8 in 18,124?
What is the value of the 9 in 194,002?
What is the value of the 5 in 5,346,041?
Sorting Pattern Blocks
Look for “PB”
on your
Geometry
Template.
Math Message
Constructing Triangles and
Quadrangles
Join 3 straws of different lengths and lay your
construction flat on your desk.
What is this shape called?
triangle
Literally means “3” angles.
How many tires does a tricycle have?
TRI- always means 3.
Constructing Triangles and
Quadrangles
Use any 4 straws and place your creation on
your desk.
What is a four-sided shape called?
quadrangle or quadrilateral
Literally means “4” angles or “4” sides.
QUAD always means 4.
Types of Quadrangles or
Quadrilaterals
• Make a quadrangle with all four sides
equal length.
– What is this shape called? square
Pull two opposite corners of the square in
opposite directions.
Are the angles still right? NO
Are the pairs of opposite sides the same
length? YES
What is the new shape called? rhombus
More Quadrangles and
Quadrilaterals
Use two straws of one length and two
straws of a different length.
Make a quadrangle with pairs of opposite
sides the same length and all right
angles.
What is this shape called?
rectangle
More Quadrangles and
Quadrilaterals
Pull two opposite corners of the rectangle
in opposite directions.
Are the angles still right? NO
Are the pairs of opposite sides the same
length? YES
What is the new shape called? parallelogram
TRAPEZOIDS
Make a trapezoid.
Are the angles right angles?
Probably NOT, but TWO angles in a
trapezoid may be right angles
Are any of the sides the same length?
Possibly, but all sides may have
different lengths.
Wrap it Up!
Exit Slip
Choose two of the quadrangles you
made in this lesson and explain how
they are alike and different.
Independent Work Math Journal p 7
Homework
Math Box