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Angles and Equations

Angles and Equations. Quiz. A(9, -4), B(-3, 0), and C(1, 4) are vertices of a triangle. 1. Find the slope of AB 2. Find the slope of BC 3. Find the slope of AC. 4. Is ∆ABC a right triangle? 5. Why or why not?. Important Facts. Angles of a triangle add up to 180°

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Angles and Equations

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  1. Angles and Equations

  2. Quiz • A(9, -4), B(-3, 0), and C(1, 4) are vertices of a triangle. • 1. Find the slope of AB • 2. Find the slope of BC • 3. Find the slope of AC. • 4. Is ∆ABC a right triangle? • 5. Why or why not?

  3. Important Facts • Angles of a triangle add up to • 180° • Angles of a quadrilateral add up to • 360° • Supplementary angles add up to • 180 ° • Complementary angles add up to • 90 ° • Vertical angles are equal.

  4. Find x. 38 ° x = 7 (6x - 4) °

  5. Find x. (19x – 15) ° (15x – 7) ° x = 2

  6. Find the complement of angle R. • Find the supplement of angle R. 27 ° R 63° 153°

  7. Ray MR bisects <LMN. <LMR = (8x + 28) ° <RMN = (10x + 4) °. Find x. • Find m<LMN. 248°

  8. 60° 120° 60° 85° 95° 85° 155 ° 25° 155° 25 ° 5 6 4 9 95º 8 10 7 3 120° 1 2

  9. A quadrilateral has vertices at A(0, 5), B(3, 0), C(0, -5) and D(-3, 0) • 1. Find the slope of AB. • 2. Find the slope of BC. • 3. Find the slope of CD. • 4. Find the slope of AD. • 5. Is this a trapezoid? • 6. Why or why not?

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