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Glencoe Math: Course 2, Volume 2

GM

Glencoe Math: Course 2, Volume 2 View details

2. Complementary and Supplementary Angles

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Exercise 4 Page 547

What is the sum of the measures of two complementary angles?

25

Practice makes perfect

We want to find the value of x.

angles

Because the angles in the diagram form a right angle, we know that they are complementary. This means that their measures should equal 90^(∘). We can solve for x by creating an equation using the expressions for the two smaller angles and their sum.

2x + 40 = 90

LHS-40=RHS-40

2x = 50

.LHS /2.=.RHS /2.

2x/2 = 50/2

Calculate quotient

x = 25

Subchapter links

Guided Practice p.546

Independent Practice p.547-548

H.O.T. Problems p.548

Standardized Test Practice p.548-550

Extra Practice p.549

Common Core Review p.550