00:00 10 marks

  • Exam Style - Paper 3
  • HL
  • Tier 4
  • Angle between a line and a plane
  • Parametric equation of a line
  • Vector equations of planes and lines
  • Scalar product and vector product
  • Normal vector to a plane
  • Point-normal form of a plane equation
  • Intersection of lines and planes
  • Perpendicular distance from a point to a plane
  • Spatial reasoning in 3D

Consider the following scenario in 3D space:

A plane \(\Pi\) passes through the point A(1, 2, 3) and is parallel to the vectors \(u = \begin{pmatrix} 2 \\ -1 \\ 1 \end{pmatrix}\) and \(v = \begin{pmatrix} 1 \\ 1 \\ -2 \end{pmatrix}\).

A line L is given by its parametric equation: \(r = \begin{pmatrix} 4 \\ 0 \\ -1 \end{pmatrix} + t\begin{pmatrix} 1 \\ 2 \\ 3 \end{pmatrix}\), where \(t \in \mathbb{R}\).

Additionally, consider the point P(0, -2, 5).

Answer the following parts:

Part a

3 minutes 3 marks

Question

Given that a plane \(\Pi\) passes through A(1, 2, 3) and is parallel to \(u = \begin{pmatrix} 2 \\ -1 \\ 1 \end{pmatrix}\) and \(v = \begin{pmatrix} 1 \\ 1 \\ -2 \end{pmatrix}\), determine the scalar equation of the plane \(\Pi\).



Hint Hint

Hint

First, calculate the normal vector to the plane using the cross product of the direction vectors. Then, use the point-normal form to find the scalar equation.

  • Answer Answer

Complete Answer

The scalar equation of the plane \(\Pi\) is: \(x + 5y + 3z – 20 = 0\).

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Part c

2 minutes 2 marks

Question

Calculate the perpendicular distance from the point P(0, -2, 5) to the plane \(\Pi\) with equation \(x+5y+3z-20=0\).



Hint Hint

Hint

Use the formula for the perpendicular distance from a point to a plane.

  • Answer Answer

Complete Answer

The perpendicular distance from point P to the plane \(\Pi\) is \(\frac{15}{\sqrt{35}} = \frac{3\sqrt{35}}{7}\) units, approximately 2.54 units.

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Part d

2 minutes 2 marks

Question

Calculate the acute angle between the line L, with direction vector \(d = \begin{pmatrix} 1 \\ 2 \\ 3 \end{pmatrix}\), and the plane \(\Pi\) with equation \(x+5y+3z-20=0\).



Hint Hint

Hint

Find the angle between the direction vector of the line and the normal vector of the plane, and then use the complementary angle to find the angle between the line and the plane.

  • Answer Answer

Complete Answer

The acute angle between the line L and the plane \(\Pi\) is approximately \(25.5^\circ\).

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