Glencoe Math: Course 3, Volume 2
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Glencoe Math: Course 3, Volume 2 View details
3. Angles of Triangles
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Exercise 11 Page 394

The sum of the measures of the interior angles of a triangle is

and

Practice makes perfect

We want to find the measures of the angles in the given triangle.

triangle

To find these angle measures, we will first recall a key piece of information!

Angle Sum of a Triangle

The sum of the measures of the interior angles of a triangle is

With this rule, we can write an equation connecting the measures of the angles of our triangle.
Let's solve the equation and find the value of For simplicity, we will not write the degree symbol.
Solve for
The measure of one of the angles is To find the other missing measures, we will substitute in the expressions for the remaining angles, and Let's start with Once again, we will remove the degree symbol for the calculation.
The measure of the second angle is Now, let's find the measure of
The measure of the third angle is
triangle