Measuring Objects - Texas Instruments TI-73 Manual Book

Measuring Objects

Valid Shapes for Area and Perimeter Measurements
Valid shapes for measuring areas and perimeters are shapes
that have no intersecting lines and do not use the same peg
more than once. The message
attempt to measure the area or perimeter of an invalid shape.
Valid shape
Restrictions on Fraction Results
For lengths, areas, and perimeters, Geoboard gives decimal or
fraction results, depending on the Decimal/Fraction format
setting. Fraction measurements that are irrational (such as a
hypotenuse that is
TI-73 Geoboard
Shape Error
Invalid shape
(lines cross)
) are approximated (56/25 in this case).
5
appears if you
Invalid shape
(upper peg used twice)
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