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### JC Vectors summary

• 1. Math Academy: Vectors Revision 1 Ratio Theorem µ λA P B O If −→ AP : −−→ PB = µ : λ, then −−→ OP = µ −−→ OB + λ −→ OA λ + µ . 2 Scalar Product a b θ a · b = |a||b| cos θ. Note that the direction of the 2 vectors must be as shown above. Properties of scalar product Note the difference between the first 2 points, with vector product. (a) (i) a · a = |a|2 (ii) a · b = b · a (iii) a · (b + c) = a · b + a · c (iv) a · λb = λ(a · b) = (λa) · b (b) Perpendicular Vectors If a and b are perpendicular, then a · b = 0. (c) Length of projection θ a b |a · ˆb| (d) Projection vector Projection vector of a onto b is given by (a · ˆb)ˆb or ( a · b |b| ) b |b| . 3 Vector Product a × b = (|a||b| sin θ)ˆn |a × b| = |a||b| sin θ Properties of vector product Note the difference between the first 2 points, with scalar product. (a) (i) a × a = 0 (ii) a × b = −b × a (iii) a × (b + c) = a × b + a × c (iv) a × λb = λ(a × b) = (λa) × b (b) Area of Triangle A B C h θ 1 2 −−→ AB × −−→ BC = 1 2 |cross product of two adjacent sides| (c) Area of Parallelogram A B C h θ D −−→ AB × −−→ BC = |cross product of two adjacent sides| 4 Lines Vector Equation Parametric: r = a + λm, λ ∈ R Cartesian: x − a1 m1 = y − a2 m2 = z − a3 m3 . Note: Ensure that you know how to change from vector to cartesian and vice versa. www.MathAcademy.sg 1 © 2019 Math Academy
• 2. Math Academy: Vectors Revision Relationship between two lines l1 : r = a1 + λm1 l2 : r = a2 + µm2 a) Case 1: Parallel lines Step 1: To check parallel: Check if m1 is a scalar multiple of m2. Step 2: If parallel, check if they are the same line: Take a point from ℓ1 and see if it lies on ℓ2. (i) If the point is in ℓ2, they are the same line. (ii) Otherwise, they are parallel, non- intersecting lines. Make sure you know how to show the working! (re- fer to main notes) b) Case 2: Intersecting/Skew lines Method 1: Equate both equations together, use GC to solve. No solution =⇒ Skew lines Solution found for λ and µ =⇒ Intersecting lines Method 2: Step 1: Equate both equations together, solve for the i and j - components. Step 2: Sub into k- component. See if it satisfies this component. Satisfies =⇒ intersecting. No satisfy =⇒ skew. This is the same way to find point of intersection of 2 lines. 5 Planes Parametric: r = −→ OA + λm1 + µm2 Scalar-Product: r · n = a · n Cartesian: ax + by + cz = D Ensure you know how to switch from parametric to scalar-prod to cartesian and cartesian to scalar-prod. You DONT have to know how to switch from scalar- prod/cartesian to parametric. 6 Foot of Perpendicular a) From point to line Given: (1) −−→ OP (2) ℓ : r = −→ OA + λm, λ ∈ R. We find the foot from point P to line ℓ. Since −−→ OF lies on the line ℓ, −−→ OF = −→ OA + λm, for some λ ∈ R A P F ℓ m O −−→ PF · m = 0 ( −−→ OF − −−→ OP) · m = 0 ( −→ OA + λm − −−→ OP) · m = 0. We solve the only unknown, λ, and substitute back into the equation −−→ OF = −→ OA + λm. b) From point to plane P N n Π Given point P and equation of the plane Π : r · n = D (1) Step 1: Form the equation of the line ℓ that passes through P and is perpendicular to Π. ℓ : r = −−→ OP + λn, λ ∈ R. (2) Step 2: Intersect ℓ with Π to get the foot of the perpendicular. That is, substitute (2) into (1). ( −−→ OP + λn) · n = D Substitute λ back into (2) to get the foot of the perpendicular. www.MathAcademy.sg 2 © 2019 Math Academy
• 3. Math Academy: Vectors Revision 7 Reflections In general, we need to first find reflection of a point. a) Reflect a point in a line/plane. We make use of foot of perpendicular and mid point theorem. A P P′ F ℓ O −−→ OF = −−→ OP + −−→ OP′ 2 . Make −−→ OP′ the subject. b) Reflect l1 in the line l2. ℓ2 P F P′ ℓ1 A (i) Form the new direction vector −−→ AP′ . (ii) Form the new equation using r = −→ OA + λ −−→ AP′ The same technique holds for reflection of line in a plane. c) Reflection of a plane in another plane. π1 π2 l Suppose we want to find the reflection of plane π1 in π2. Lets call it π′ 1. We also know that π1 and π2 intersect at the line l. 1) l will also lie on the reflected plane π′ 1. Hence π′ 1 also contains direction vector of l. 2) Take a point P from π1 and reflect it in π2. This reflected point P′ will be on π′ 1. Now take a point A from l (which is also on π′ 1). π′ 1 will contain direction vector −−→ AP′ . www.MathAcademy.sg 3 © 2019 Math Academy
• 4. Math Academy: Vectors Revision 8 Angles Note: For all of the following, if the question asks for ACUTE angle, you need to put modulus at the RHS, that is, at the dot product. ϕ θ Π ℓ m n Acute angle between line and a plane sin θ = m · n |m||n| . Π1 Π2 θ θ n2 n1 Acute angle between 2 planes cos θ = n1 · n2 |n1||n2| . θ ℓ1 ℓ2 m1 m2 Acute angle between two lines cos θ = m1 · m2 |m1||m2| . 9 Distance involving lines ℓ : r = a + λmA B θ | −−→ AB × ˆm| | −−→ AB · ˆm| 10 Distance involving planes Distance between point and plane B A n Π F θ | −−→ AB · ˆn| | −−→ AB × ˆn| Distance between parallel line/plane with plane A B | −−→ AB · ˆn| Π F ℓ A B | −−→ AB · ˆn| Π2 F Π1 | −−→ AB × ˆn| | −−→ AB × ˆn| www.MathAcademy.sg 4 © 2019 Math Academy
• 5. Math Academy: Vectors Revision 11 Distances from Origin Distance from origin to plane If r · ˆn = d, then, Distance from origin to plane = |d| Ensure that the equation is ˆn, not n! Π1 Π2 O d1 d2 n Distance between 2 parallel planes Π1 : r · ˆn = d1 Π2 : r · ˆn = d2 Distance between the two planes = |d1 − d2|. Note: If d1 and d2 are of opposite signs, then they lie on opposite sides of the origin. 12 Relationship between line and plane n ℓ : r = a + λm m Π : r · n = d (a) If a line and plane are parallel, m · n = 0 To check further if the line is ON the plane, we sub the equation of the line into the plane, see if it satisfies the equation. (refer to notes) (b) If a line and plane are perpendicular, m is parallel to n =⇒ m = kn for some constant k ∈ R. 13 Relationship between two planes (a) Parallel planes Two planes are parallel to each other ⇐⇒ Their normals are scalar multiple of each other. (b) Non-Parallel planes Any 2 non parallel, non identical planes will inter- sect in a line. n1 n2 ℓ Π1 Π2 The direction vector, m, of the line of intersection between Π1 and Π2 is given by m = n1 × n2, where n1, n2 are the normal vectors of Π1 and Π2 respectively. However! We will use a GC if there are no unknowns in n1 and n2. (c) Two perpendicular planes p1 p2 n2n1 If 2 planes, p1 and p2 are perpendicular, then the following occurs: (a) n1 is parallel to p2 =⇒ p2 contains the direc- tion vector n1, (b) n2 is parallel to p1 =⇒ p1 contains the direction vector n2. www.MathAcademy.sg 5 © 2019 Math Academy
• 6. Math Academy: Vectors Revision 14 Directional Cosines x y z   α β γ   Let the angles made with the x, y, and z-axes be θ, ϕ, and ω respectively. x-axis: cos θ = α √ α2 + β2 + γ2 y-axis: cos ϕ = β √ α2 + β2 + γ2 z-axis: cos ω = γ √ α2 + β2 + γ2 15 On Geometrical Meanings Recall the following diagram on projections: b a |a · ˆb| |a × ˆb| θ Lets now deal with geometrical interpretations. (a) |a · ˆb| (b) |a × ˆb| (c) (a · ˆb)ˆb Let b be any non-zero vector and c a unit vector, give the geometrical meaning of |c · b|. Let a, d be any 2 non-zero vectors. (d) Give a geometrical meaning of |a × d|. (e) Suppose we have, (i) a · d = 0, (ii) a × d = 0, what can be said about the relationship between a and d in each case? (f) Interpret geometrically the vector equation r · n = d, where n is a constant unit vector and d is a constant scalar, stating what d represents. [3] www.MathAcademy.sg 6 © 2019 Math Academy
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