1.3 Day 2 – Triangles and Quadrangles

Homework ReviewIn 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 MathUse 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.

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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?

Pull two opposite corners of the square in opposite directions.

Are the angles still right?

Are the pairs of opposite sides the same length?

What is the new shape called?

square

NO

YES

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? Are the pairs of opposite sides the same

length?What is the new shape called?

NO

YES

parallelogram

TRAPEZOIDSMake 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

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