WARM UP LEARNING GOALS

WARM UP

Solve each equation.

1. 90 = Sx + x 2. x + 3x = 180 3. (180 - x) + (90 - x) = 210

LEARNING GOALS

? Calcu late th e supplement of an angle.

! ? Calculate the complement of an angl e.

? Classify adjacent angles, linear pairs, and vertical angles.

? Use facts about supplementary, comp lementary,

vertical, and adjacent angles and linear pairs in multi-

step problems to write and so lve simp le equations for

unknown angles.

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4. ~X + X = 180 - X

KEY TERMS

? straight angle i ? supplementary angles

? complementary angles ? perpendicular ? collinear ? adjacent angles ? linear pair ? vertical angles

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You know how to classify individual angles based on their measure. Now consider how angles are related to each other. What types of specia l relationships exist between pairs of angles?

LESSON 2: Specia l Delivery ? MS- 19

Two ang les are supplementary angles if t he sum of t hei r ang le measure s is equa l t o 180?.

Two ang les are

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complementary

angles if th e sum of

t hei r ang le measures

is equa l to 90?.

To "d raw" means you can use your m e a s u r e ment tools. .. so, get out yo ur protractor a nd stra ightedge.

In t he p rev ious activit y, you created supp lementary angles and

complementary angles.

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Let 's cre ate sets of su pp lem ent ary angles.

1. Use a p10lt acto? te draw a pair of supplementary angles that share a side. What is the measure of each angle?

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2. l::l!e e pretl"eetor :to draw a pair of supplementary angles that

do not share a side. What is the measure of each angle?

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