Dot Product: Formula Of Dot Product And Dot Method Usage For Vectors 

 October 7, 2021

When multiplying two or more vectors, the dot product can be used as a method of multiplying them. The dot product of vectors yields a scalar amount as a consequence. Dot products are sometimes known as scalar products. There are two integers in a series, and they are added together in algebraically equal amounts.


From a geometric perspective, the dot product represents the product of the mass of two vectors and the respective cosine of the angle between them. There are many uses for the dot product of vectors in geometry, mechanics and engineering. To learn more about the dot product, keep reading.


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Dot Product Method


This means that you may multiply vectors using the dot product method or the vector-product method. The output of both methods is the same: A scalar. The product between two vector quantities that results in a scalar is known as the respective dot product. Scalar number derived by executing an operation on the vector components of the data matrix.


The dot product can only be used with vectors that have the same number of dimensions as the other vector pair. It is a heavy dot that is used as a sign for the dot product. There are many applications for this type of product in mathematics and physics. As a result of this post, we’ll go through the dot product of vectors in depth, including its definition, formula, and an actual example.

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Definition And Formula Of Dot Product


This vector algebra makes use of two vectors in a given formula which is a= [a1, a2, a3, a4 and it continues…. a(n)] and b= [b1, b2, b3, b4 and it continues…. b(n)].

Then the dot product will be:

a*b = a1*b1 + a2*b2 + a3*b3 + a4*b4 + it continues till…. a(n)*b(n)

→  →

A . b= ∑ ni = 1aibi


Algebraic Meaning Of Dot Product


When two vectors are multiplied together, they form a dot product that is equal to their magnitudes multiplied by their cosine. Whenever two vectors are multiplied by a dot product, their output is located in the same plane as their original vectors. The dot product can be either a positive or a negative value in actual terms.

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Dot Product of Two Vectors


Use the dot product to determine the component of one vector in the direction of another vector by using the dot product. In other words, the shadow cast by a given vector on a second vector equals the length of that shadow’s shadow. In order to calculate it, you multiply the magnitude of a pair of supplied vectors by a cosecant of their respective angles. Scalar values are the outcome of vector projection formulas.


Properties Of Dot Product Of Two Vectors

Given below are the properties of vectors:


  • Commutative Property- a .b = b.aa.b =|a| b|cos θ a.b =|b||a|cos θ
  • Distributive Property- a.(b + c) = a.b + a.c
  • Bilinear Property- The product of vectors is evenly distributed like the normal numbers.
  • Scalar Multiplication Property- (xc).(yd) = xe*(b.c)
  • Non-Associative Property- One must realize that obtaining dot product between a scalar and vector is not possible.
  • Orthogonal Property – Two vectors are said to be orthogonal when the respective dot product between them is zero.
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Formula of Dot Product in Terms Of Vector Components



The geometric point of view the dot product clearly signifies that the dot product of two vectors

a and b which states that: –





where, theta(θ) is the respective angle between the two vectors whose dot product is being computed. This formula can explain the properties of the dot product well. However, it is very important to deduce a formula related to vectors to get an accurate result.

One needs to be focus on the dot product between the standard unit vectors such as i, j and k respectively.

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The above article talks about dot product and its formula based on components of vectors as well as all geometrical and algebraic meaning and the properties. Want to learn more? Visit Cuemath.

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