Angle Relationships & Parallel Lines

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Presentation transcript:

Angle Relationships & Parallel Lines Pre-Algebra

Complementary Angles sum to 90° 50° 40°

Complementary angles add up to 90º. 30º 40º 50º 60º Adjacent and Complementary Angles Complementary Angles but not Adjacent

Supplementary Angles sum to 180° 150° 30°

Supplementary angles add up to 180º. 40º 120º 60º 140º Adjacent and Supplementary Angles Supplementary Angles but not Adjacent

Practice Time!

1) Find the missing angle. ?° 36°

1) Find the missing angle. ?° 36° 90 ° – 36 = 54°

2) Find the missing angle. ?° 64°

2) Find the missing angle. ?° 64° 90 ° – 64° = 26°

3) Solve for x. 2x° 3x°

3) Solve for x. 2x° 3x° 3x° + 2x° = 90° 5x = 90 x =18

4) Solve for x. x + 25 2x + 5

4) Solve for x. x + 25 2x + 5 (2x + 5) + (x + 25) = 90 3x + 30 = 90

5) Find the missing angle. 168° ?°

5) Find the missing angle. 168° ?° 180° – 168° = 12°

6) Find the missing angle. ?° 58°

6) Find the missing angle. ?° 58° 180° – 58° = 122°

7) Solve for x. 5x 4x

7) Solve for x. 5x 4x 4x + 5x = 180 9x = 180 x = 20

8) Solve for x. 3x + 20 2x + 10

8) Solve for x. 3x + 20 2x + 10 (2x + 10) + (3x + 20) = 180

The End