Texas Instruments TI-83 Plus Manual Book page 40

Chapter 1: Number Sense
Section 3: Real Numbers
³ Try-It!é on Your TI.83 Plus or TI.73
Investigate how the calculator deals with irrational numbers.
In the Overview , you used the Pythagorean theorem to find the length of
triangle so that the hypotenuse has length
mathematician, discovered irrational numbers (numbers that are not rational and therefore are
not ratios). There is a proof that, for example,
Hint: Draw each leg with length 1 inch. The hypotenuse is
À
Remember that
2
You created this length in your picture above.
Look at the square whose side has a length of
À
that the area is
2
Topics in Algebra 1
À
Q
= . Picture this by envisioning a square whose sides measure
2 2
À
Q
= square units? Count it up! Shade in the area on the screen shown.
2 2
© 2001 Texas Instruments
Name
Date
À
. Pythagoras (569–475
2
À
cannot be written as a fraction.
2
Á À À
1 2 +1 2 = 1+1 = 2
À
on the Geoboard screen below. Can you see
2
À
. Draw a right
2
. .), a great Greek
B C
À
2
From the TI-73 Geoboard
application
Student Worksheet 1-26
units.