Glencoe Math: Course 2, Volume 2
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Glencoe Math: Course 2, Volume 2 View details
1. Solve One-Step Addition and Subtraction Equations
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Exercise 10 Page 442

Use the fact that the sum of angle measures in a triangle is 180.

Equation: x+35+45=180
Missing Measure: 100^(∘)

Practice makes perfect

We want to write and solve an equation to find the missing measure x in the given triangle.

To do this, we can use the fact that the sum of the measures of the angles of a triangle is 180^(∘).
Let's use this fact to write an equation by adding the given measures and setting the sum equal to 180. x+ 35+ 45=180 Now, let's solve the equation for x.
x+35+45=180
x+80=180
x+80-80=180-80
x=100
The missing measure is 100^(∘).