Determine a missing angle measurement using the

sum of the interior angle of the polygons

By :Jourdynn Leigh Dickerson

Main Menu

• What is a Quadrilaterals

• Angles in a quadrilaterals

• Missing angles in a quadrilaterals

What is a Quadrilateral ?

• A Quadrilateral is a polygon that has four sides.

• An example of a quadrilateral is a square or rectangle or a trapezoid.

Question #1

• 1) Which of the following is NOT a Quadrilateral?

• A) Rectangle• B)Square• C)Circle

Question #2

• What is a Quadrilateral?

• A) Polygon with 4 sides• B)Polygon with 6 sides • C)Polygon with 3 sides

Omg Look

I’m a Square!!!!!!!

I’m a Square!!!!!!!

I’m a Rectangle!!!!!!

I’m a Rectangle!!!!!!

I am a Trapezoid

Look AtThisChart!!!

Name Sides AnglesTriangle 3 3

Quadrilateral 4 4

Pentagon 5 5Hexagon 6 6Heptagon 7 7Octagon 8 8Nonagon 9 9Decagon 10 10

Angles in a Quadrilaterals

• There should be 4 angles in a Quadrilateral.• A angle is a figure formed by 2 lines diverging

in a common point.• Here are some examples of angles

Question # 1

• 1) What is a angle?

• A)A figure formed by 2 lines diverging in a common point.

• B) A figure formed by 5 lines diverging in a common angle bisector.

• C) A figure formed by 7 lines diverging in a common point.

Question # 2

• How many angles are in a quadrilateral?

• A)6• B)4• C)17

Missing angles in a Quadrilaterals.

• First of all the angles in a quadrilateral add up to 360º.

• Then to find the missing angle in a quadrilateral go to the next slide.!

How to find a missing Angle

• First you have to follow this procedure:

• First you add up all the angles except for the missing angle.

• Next you have to subtract whatever number you got from the last one from 360º.

• Finally you’ve got your answer !!!

Question #1

• In a quadrilateral what does all the angles equal up to?

• A)399• B)400• C)360

Question #1

• How do you find the missing angle of a quadrilateral? True or False.

• Step 1:Add• Step 2: Subtract• Step 3:Answer

Guess What……..

Sorry you were incorrect !

GUESS WHAT…………. Your correct!! Your correct!! Your correct!!

Your correct!! Your correct!! Your correct!!

Congratulations

your right!!!