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.
Bring a new dimension of learning to your classroom with activities that put math in motion.
Explore teaching strategies to help students succeed on the SAT® and ACT® math tests using TI technology.
Drive deeper, more relevant understanding of science in middle grades and high school.
Students represent and analyze mathematical situations and structures using algebraic symbols.
Students consider a triangle ABC. They use the sine ratio to determine the measure of angle A.
They use their calculator to plot the graph for the ratio and the sine.
After graphing the two, students use TRACE to help students see that the ratio 14.7/17.3 is about 0.8497.
Students move to one of the intersection points. It appears to be about 124°. Then they move to another intersection point, it appears to be about 57°.
They will see that either 124° or 57°, is going to be the measurement of angle
To get a more exact estimate, examine a table in smaller increments or students can by using the intersect tool.
Another choice that students have is finding the sine inverse of the ratio.
At the end of this activity, students will know several ways to find a missing angle of a right triangle. They will also be able to find the intersection of two graphs.
© Copyright 1995-2020 Texas Instruments Incorporated. All rights reserved.