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Algebra

Chapter 3

Problem 1

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The sum of the measures of the three angles
of any triangle: sum = (a + b + c) degrees.
The sum of the measures of the three angles shown
in the figure above is degrees.


Example:

The sum of the three interior angles of any triangle is 180 degrees.

The measure of angle y = 40 degrees.

One angle is a right angle = 90 degrees.
Solution: The measure of angle x = (180 - 90 - 40)degrees.
So, the measure of angle x = 50 degrees

To solve using the graphing calculator, enter 180-90-40
into the Function f(x) = box. Then click on the Plot Graph
button. The answer will appear below the Function f(x) = box