Analytic Geometry: Coordinate Systems and Equations

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Questions and Answers

What fundamental principle underlies calculating the distance between two points, both in a plane and in space?

  • The Pythagorean Theorem. (correct)
  • The principles of trigonometry.
  • The properties of vector projections.
  • The properties of similar triangles.

In analytic geometry, how are points represented within the Cartesian coordinate system?

  • By an ordered pair (x, y) in two dimensions. (correct)
  • By a geometric shape with defined angles.
  • By a single real number on a number line.
  • By vectors indicating magnitude and direction.

Suppose you have two points in space, A(1, 2, 3) and B(4, 5, 6). What is the distance between points A and B?

  • $\sqrt{10}$
  • $\sqrt{18}$
  • $3$
  • $3\sqrt{3}$ (correct)

Which of the following statements accurately describes Rene Descartes' contribution to the field of mathematics?

<p>He established a geometry using a coordinate system. (D)</p> Signup and view all the answers

In a two-dimensional Cartesian coordinate system, what term is used to describe the horizontal coordinate of a point?

<p>Abscissa (D)</p> Signup and view all the answers

Line A passes through points (1, 5) and (3, 9). Line B is perpendicular to Line A. What is the slope of Line B?

<p>$-\frac{1}{2}$ (A)</p> Signup and view all the answers

A line is parallel to the x-axis. What is its slope?

<p>0 (A)</p> Signup and view all the answers

Line P has a slope of 3. Line Q has a slope of -1/3. What is the relationship between Line P and Line Q?

<p>Perpendicular (A)</p> Signup and view all the answers

Given two lines with slopes $m_1 = 2$ and $m_2 = 5$, what is the tangent of the angle between these two lines?

<p>$3/11$ (C)</p> Signup and view all the answers

Which condition indicates that two lines are parallel?

<p>Their slopes are equal. (D)</p> Signup and view all the answers

What is the slope of a line parallel to the y-axis?

<p>Infinity (B)</p> Signup and view all the answers

Three points A(1, 2), B(4, 7), and C(6, 3) form a triangle. If the coordinates are listed in a counterclockwise direction, which order is correct for using the area formula?

<p>A, B, C (C)</p> Signup and view all the answers

A triangle has vertices at (0, 0), (1, 1), and (2, 0). If calculating the area using coordinate geometry, what is the correct sequential order of these points?

<p>Counter-clockwise order only. (A)</p> Signup and view all the answers

A point (1, 2) is located near a line defined by $3x + 4y + 5 = 0$. According to the convention provided, which sign should be used in the point-to-line distance formula?

<p>Positive, because B is positive and the point is above the line. (A)</p> Signup and view all the answers

Two parallel lines are defined by the equations $2x + 3y + 6 = 0$ and $2x + 3y + 12 = 0$. What is the correct setup to calculate the distance d between them?

<p>$d = \frac{|6 - 12|}{\sqrt{2^2 + 3^2}}$ (D)</p> Signup and view all the answers

A line segment is defined by the points (1, 5) and (4, 2). Point P divides this segment in a 2:1 ratio. Which formula accurately calculates the x-coordinate of point P?

<p>$x = \frac{(1 \cdot 2) + (4 \cdot 1)}{2 + 1}$ (B)</p> Signup and view all the answers

A line segment has endpoints at (8, -2) and (4, 6). What are the coordinates of the midpoint of this segment?

<p>(6, 2) (D)</p> Signup and view all the answers

Consider a line segment with endpoints A(2, -3) and B(5, 1). If point P divides AB in a 1:2 ratio, find the y-coordinate of point P.

<p>-5/3 (B)</p> Signup and view all the answers

Given two parallel lines defined by $4x - 3y + 8 = 0$ and $4x - 3y - 7 = 0$, calculate the distance between them.

<p>3 (C)</p> Signup and view all the answers

A point (5, -1) is near the line $-2x + 5y - 3 = 0$. Determine the correct sign to use in the point-to-line distance formula according to the provided conventions.

<p>Negative, because B is positive and the point is likely below the line. (C)</p> Signup and view all the answers

Find the midpoint of a line segment with endpoints at (-3, 7) and (5, -9).

<p>(1, -1) (C)</p> Signup and view all the answers

Flashcards

Analytic Geometry

A branch of Mathematics combining Algebra and Geometry through coordinates.

Cartesian Coordinates System

A coordinate system where each point is identified by an ordered pair (x, y).

Distance Formula (2D)

Formula to find the distance between two points: d = √((x2 - x1)² + (y2 - y1)²).

Distance Formula (3D)

Extends the distance formula to three dimensions: d = √((x2 - x1)² + (y2 - y1)² + (z2 - z1)²).

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Distance between Line and Point

Calculates how far a point is from a line using the line's equation Ax + By + C = 0.

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Distance formula between point and line

d = ±√(A² + B²) for line Ax + By + C = 0

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Positive distance condition

Use + if B is positive and point is above/right the line

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Negative distance condition

Use + if B is negative and point is below/left the line

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Distance between parallel lines

d = |C1 - C2| / ±√(A² + B²) uses absolute difference

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Division of line segment

Point P divides segment between (x1,y1) and (x2,y2) with ratios r1, r2

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Abscissa of point P

x = (x1r2 + x2r1) / (r1 + r2) for divided segment

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Ordinate of point P

y = (y1r2 + y2r1) / (r1 + r2) for divided segment

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Midpoint of a line segment

Midpoint coordinates: x = (x1 + x2)/2, y = (y1 + y2)/2

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Slope of a line (m)

The slope is the rise (∆y) over run (∆x) of a line, m = ∆y/∆x.

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Horizontal line slope

A line parallel to the x-axis has a slope of zero (m = 0).

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Vertical line slope

A line parallel to the y-axis has a slope of infinity (m = ∞).

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Parallel lines

Parallel lines have the same slope (m1 = m2).

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Perpendicular lines

For perpendicular lines, the slopes are negative reciprocals (m2 = -1/m1).

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Angle between two lines

The angle θ between lines with slopes m1 and m2 is given by θ = tan⁻¹((m2 - m1)/(1 + m2*m1)).

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Area of a triangle by coordinates

The area of a triangle with vertices (x1,y1), (x2,y2), (x3,y3) is determined using counterclockwise order.

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Formula for triangle area

Use the determinant method for the area: Area = ½ | x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2) |.

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Study Notes

Analytic Geometry

  • Analytic geometry combines algebra and geometry
  • Uses coordinate systems to study geometric shapes
  • Rene Descartes pioneered the use of coordinate systems in 1637.

Rectangular Coordinate System

  • Also known as the Cartesian coordinate system
  • A two-dimensional system
  • Each point is represented by an ordered pair (x, y)
  • x-axis (horizontal): abscissa
  • y-axis (vertical): ordinate
  • Quadrants: I (+,+), II (-,+), III (-,-), IV (+,-)

Distance Between Two Points in a Plane

  • Distance formula: d = √((x₂ - x₁)² + (y₂ - y₁)²).

Distance Between Two Points in Space

  • Distance formula: d = √((x₂ - x₁)² + (y₂ - y₁)² + (z₂ - z₁)²).

Equations of Lines

  • General Equation: Ax + By + C = 0
  • Point-Slope Form: (y - y₁) = m(x - x₁)
  • Slope-Intercept Form: y = mx + b
  • Two-Point Form: (y - y₁) = (y₂ - y₁)/(x₂ - x₁) * (x - x₁)
  • Intercept Form: x/a + y/b = 1

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