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Glencoe Math: Course 3, Volume 2

GM

Glencoe Math: Course 3, Volume 2 View details

Chapter Review

Exercise 3 Page 443

The sum of the measures of the interior angles of a triangle is 180^(∘).

46

Practice makes perfect

We want to find the value of x in the given triangle.

triangle

To find the value of x, 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 180^(∘).

With this rule, we can write an equation connecting the measures of the angles of our triangle. x^(∘)+ 55^(∘)+ 79^(∘)=180^(∘) Let's solve the equation and find the value of x. For simplicity, we will not write the degree symbol.

x + 55 + 79 = 180

▼

Solve for x

Add terms

x + 134 = 180

LHS-134=RHS-134

x = 46

Subchapter links

Key Concept Check p.442

Problem Solving p.443

Answering the Essential Question p.444