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.
Explore lessons that cover essential, foundational mathematics concepts.
Enhance your teaching with a hands-on learning experience.
We are here to help with distance learning resources for schools and districts.
Update OS, transfer files andtake screen captures for yourTI-Nspire™ CX II graphing calculator.
Texas Instruments
9-12
15 Minutes
TI-Nspire™TI-Nspire™ CAS
3.2
In this activity, students will represent a triangle with a matrix and use the determinant to find the area of three given triangles.
In this activity, students will find the area of a right triangle using a matrix and verify the formula using A = 0.5bh.
Then students will practice using the matrix formula and confirm their answer by finding the area of the triangle on the Graphs application.
In the extension, students are asked to find the vertex of a triangle given the other two vertices and the area. They can solve this problem algebraically or use a Graphs page.
TI websites use cookies to optimize site functionality and improve your experience. To find out more or to change your preferences, see our cookie policy page. Click Agree and Proceed to accept cookies and enter the site.
You can control your preferences for how we use cookies to collect and use information while you're on TI websites by adjusting the status of these categories.