Geometry MATERIALS: Six dice, nine note cards with the phrases below

Try These Triangles

Shuffle the cards and place them face down. To begin, one person rolls the six dice, announces the sum of the numbers, and turns over a card. Everyone in the group must then draw a triangle that contains one angle equal to the announced number and satisfies the condition given on the card. Each person should identify the measure of each angle in his or her triangle. Players then check each other's answers for correctness.

The activity continues until everyone has had a chance to roll the dice and turn over a card.

©Glencoe/McGraw-Hill Pre-Algebra

STATEMENTS TO BE WRITTEN ON THE NOTE CARDS:

Acute triangle
Right triangle
Obtuse triangle
One angle twice another angle
One angle 30 degrees more than another angle
Two equal angles
One angle 20 degrees more than another angle
One angle three times another angle
One angle 12 degrees less than another angle