Fun and Games in Geometry! (That you can do on a shoestring budget!)

2011 ESA Symposium June 6-10, 2011

Cindy Kroon cindy.kroon@k12.sd.us

Montrose High School http://ck022.k12.sd.us

Montrose SD

Polygons with String

To review names and properties of polygons

1. Divide students into groups of 4 or 5. 2. Give each group a 7-8 foot length of string, tied into a circle 3. Instruct the students to form each of the following polygons:

Triangle Quadrilateral Pentagon Hexagon Decagon, etc.

4. Form each of the following quadrilaterals: Trapezoid Parallelogram Rhombus Kite Rectangle Quadrilateral with no right angle Quadrilateral with one pair of parallel sides, etc.

5. Form each of the following triangles: Equilateral Isosceles Right Acute scalene, etc.

6. Be sure to include some “impossible polygons” such as an obtuse right triangle, or a right equilateral triangle. Let the students decide through investigation whether they can be constructed.

Angles with Plates

1. Use two different colored plastic dessert plates for each unit. 2. Cut a slit from the edge to the center of each plate (along the radius). 3. Overlap the two plates at the slits. Voila! You can now form various angles

by sliding the plates. 4. Have students demonstrate angles that you designate by making the

appropriate adjustment to their plates: acute angle obtuse angle right angle straight angle 45 degree angle angle between 90 and 180 degrees 359 degree angle, etc.

5. Add a third plate (also slit along the radius) You can now form combination angle pairs: linear pair complementary angles supplementary angles

Geometry Pictionary (2 teams, 2-4 players per team) Use to review geometry terms and vocabulary. Object of the game: Be the first person to correctly identify a secret geometry symbol, term, or definition.

1. Each “drawer” tries to get his/her teammates to identify the secret geometry term or definition within a one minute time limit.

2. You may not use any symbols, letters, or numbers. 3. You may draw and gesture, no speaking. 4. The first team to correctly identify the term scores one point. 5. If neither team identifies the term before time expires, the

drawers reveal it, then rotate drawers and continue with a different term.

6. In the case of a tie, a rematch is played with a new term. 7. The role of drawer rotates among team members after each

term.

Chapter 6 vocabulary for Pictionary: CPCTC

Legs of an isosceles triangle

Base angles of an isosceles

triangle

Median of a triangle

Congruent polygons

Isosceles triangle

Base of an isosceles triangle

Vertex angle of an isosceles

Triangle

Altitude of a triangle

Angle bisector

Centroid

Transversal

Proof

Construction

Perpendicular bisector

Equidistant

Distance

Alternate interior angles

Given

Hypotenuse

Congruent triangles

SAS postulate

AAS theorem

LL theorem

Legs of a right triangle

SSS postulate

ASA theorem

HL theorem

Congruent triangles

Circle Song (Are You Sleeping?)

A equals Pi R2 Area, Area

C equals Pi times diameter, Circumference, Circumference!

Slope Song (Turkey in the Straw)

Slope is rise over run as we all know.

With the Y’s on the top and the X’s below.

Subtract the terms to get it right.

Simplify last for a wonderful sight.

(Chorus)

Rise over run, Y’s over X.

Rise over run, Y’s over X.

Subtract the terms to get it right.

Simplify last for a wonderful sight!

(repeat)

Quadrilateral Dominoes

2-3 players: Reviews properties of quadrilaterals

Object of the game: be the first to play all of your tiles.

1. Students shuffle dominoes face-down. 2. Each student draws 5 tiles. The remaining tiles

form the “boneyard.” 3. Place one tile face-up on the table. 4. Player #1 plays a tile from his hand that matches

either end of the face-up tile. If unable to play, he must draw one tile from the boneyard. If this tile is playable, he may play it. Otherwise play passes to the next player.

5. Play alternates until one player is out of tiles, or play is blocked.

Y= MX + B

(YMCA)

Students, we need to graph a straight line.

I said, students, we will have a great time.

I said, students there’s no reason to whine.

There’s no need to be unhappy…

It’s fun to graph y = mx + b

y = mx+ b

It makes a straight line and it’ll be fine

You can even find the slo-ope!

(repeat)