Math Problem Statement

Find the angle between the vectors u=(6,5), v=(4,3)

Solution

To find the angle between the vectors u=(6,5)\mathbf{u} = (6, 5) and v=(4,3)\mathbf{v} = (4, 3), we can follow the same process as before.

Step 1: Compute the dot product uv\mathbf{u} \cdot \mathbf{v}

uv=(6)(4)+(5)(3)=24+15=39\mathbf{u} \cdot \mathbf{v} = (6)(4) + (5)(3) = 24 + 15 = 39

Step 2: Compute the magnitudes of u\mathbf{u} and v\mathbf{v}

For u\mathbf{u}:

u=62+52=36+25=(61)\|\mathbf{u}\| = \sqrt{6^2 + 5^2} = \sqrt{36 + 25} = \sqrt(61)

For v\mathbf{v}:

v=42+32=16+9=25=5\|\mathbf{v}\| = \sqrt{4^2 + 3^2} = \sqrt{16 + 9} = \sqrt{25} = 5

Step 3: Compute cos(θ)\cos(\theta)

cos(θ)=3961×5\cos(\theta) = \frac{39}{\sqrt{61} \times 5}

Step 4: Compute θ\theta

θ=cos1(39561)\theta = \cos^{-1}\left(\frac{39}{5\sqrt{61}}\right)

Let's calculate this value to find the angle in degrees.

The angle θ\theta between the vectors u=(6,5)\mathbf{u} = (6, 5) and v=(4,3)\mathbf{v} = (4, 3) is approximately 2.92.9^\circ.

Would you like further details or explanations about this calculation, or do you have any other questions?

Related Questions:

  1. What are the properties of the dot product?
  2. How does the angle between vectors affect their dot product?
  3. How do you find the angle between vectors in 3D space?
  4. What happens to the angle if the vectors are multiplied by a scalar?
  5. How do you interpret an angle close to 0° between two vectors?

Tip:

When calculating angles between vectors, a small angle typically indicates that the vectors are nearly aligned.

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Math Problem Analysis

Mathematical Concepts

Vectors
Dot Product
Cosine Rule

Formulas

Dot product formula
Cosine formula for angle between vectors

Theorems

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Suitable Grade Level

High School