Find where to buy the TI-84 Plus CE graphing calculator in a variety of bold, fun colors.
Download free 90-day trial versions of the most popular TI software and handheld emulators.
Celebrate pi day with some fun, meaningful activities that show students how the mathematical constant shows up in real life!
Explore teaching strategies to help students succeed on the ACT® math test using TI technology.
Texas Instruments
9-12
45 Minutes
TI Connect™ CE
Updated on 02/10/2015
Students determine the sum of the interior angles of a quadrilateral.
Students will construct a quadrilateral and measure the interior angles.
Students will find the sum of the interior angles of their quadrilateral. Then, they will move vertices to change the angle measures and find the sum again. Students should find that the sum of the interior angles of a quadrilateral is always 360 degrees.