Divide the class into three groups and have each group choose one person who will answer questions on behalf of the whole group. Have each group take out scratch paper, pencil and a calculator (optional) Choose one group to start the game by choosing a category and an amount. Click on the link to read the question. The group whose captain raises his/her hand first gets a chance to answer, but they must wait for you to finish reading the question. If they ring before, they cannot answer that particular question. If the first group answers incorrectly, allow the other groups to try. Answers must be given in the form of “who/what is…?” and 20 seconds are given to answer each question. Add money amount for correct answers, and deduct corresponding amount for incorrect answers. Keep score for each group on the board/overhead or any medium of choice. Click on the pink back button to go back to the category board and have the team that last answered a question correctly choose the next category. Repeat above procedures until all questions have been answered for the regular round and for double Geopardy. After all categories have been played, show the final Geopardy topic. Have each group decide how much of their winnings they want to wager and write it on a piece of paper. Once they all decide, give them 45 seconds to answer the question and write it down. Have each group reveal their answer and compute the final score. Have some type of prize/reward for the winning team, i.e. pizza party, free homework pass, etc.

Name that polygon Angles It’s all in the equation Properties of all polygons

 This polygon has five sides What is a pentagon?

 This polygon has seven sides What is a heptagon?

What is a regular octagon?  The shape of a standard stop sign

 This is the name of the simplest polygon What is a triangle?

What is a dodecagon?  This polygon has twelve sides

 This is the sum of the interior angles of a triangle What is 180⁰?

 This is the sum of the interior angles of a quadrilateral What is 360⁰?

 The interior angle is always to an exterior angle at that vertex What is supplementary?

 The sum of the interior angles of a hexagon What is 720⁰?

 The sum of the exterior angles of an n-gon What is 360⁰?

 This equation can be used to find the sum of the interior angles of an n-gon What is 180⁰( n – 2 )?

 The measure of one interior angle of a regular n-gon can be found using this equation ( n – 2 )180⁰ /n?

 The measure of one exterior angle of a regular n-gon can be found using this equation What is 360⁰/n?

 This equation can be used to find the central angle of a regular polygon What is 360⁰/n?

 This equation can be used to find the number of diagonals in a polygon What is ½ ( n - 3 )n?

 Angles at each vertex on the inside of a polygon What are interior angles?

 The angle on the outside of a polygon between a side and the extended adjacent side What are exterior angles?

 Lines linking any two non-adjacent vertices What are diagonals?

 The number of square units it takes to completely fill a polygon What is area?

 The distance around a polygon What is perimeter?

Types of polygons Properties of regular polygons Quadrilaterals Nonagons

 A polygon with all equal sides and interior angles What is a regular polygon?

 Each side may be a different length, each angle may be a different measure What is an irregular polygon?

 All interior angles are less than 180°, and all vertices ‘point outwards’ away from the interior What is a convex polygon?

 One or more interior angles is greater than 180°. Some vertices push 'inwards' towards the interior of the polygon What is a concave polygon?

 A polygon where one or more sides cross back over itself, not considered to be a real polygon What is a crossed polygon?

 A line from the center to the midpoint of a side What is the apothem?

 A line from the center to any vertex of a regular polygon What is the radius?

 Largest circle that will fit inside a regular polygon What is an incircle?

 The circle that passes through all the vertices of a regular polygon What is a circumcircle?

 Another name for the apothem What is inraduis?

 A quadrilateral that has two parallel bases What is a trapezoid?

 The greatest number of obtuse angles that a quadrilateral can have What is two?

 This quadrilateral is equilateral but not equiangular What is a rhombus?

What is a rectangle?  This type of quadrilateral is equiangular, but not equilateral

 A quadrilateral with two distinct pairs of equal adjacent sides What is a kite?

 Measure of an interior angle of a regular nonagon What is 140⁰?

 Measure of an exterior angle of a regular nonagon What is 40⁰?

 Sum of its interior angles What is 1260 ⁰ ?

 Number of diagonals in a nonagon What is 27?

 The number of triangles created by drawing the diagonals from a given vertex What is 7?

 Name the polygon

 The sum of its interior angles is 4 times the sum of its exterior angles What is a decagon?