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3 years ago

Need help ASAP. I don't know what the answer is. Please help asap

Mathematics

2 answers:

IrinaVladis [17]3 years ago

7 0

Answer:

43.25 degrees B.

Step-by-step explanation:

This is an isosceles triangle (DF = EF) and so the 2 base angles are euql .

So m < x = (180 - 93.5) / 2

= 43.25 degrees

svetoff [14.1K]3 years ago

5 0

Yeah it is D i hope this helps u

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3 years ago

Find the angle between u =the square root of 5i-8j and v =the square root of 5i+j.

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Answer:

The angle between vector $\vec{u} = 5\, \vec{i} - 8\, \vec{j}$ and $\vec{v} = 5\, \vec{i} + \, \vec{j}$ is approximately $1.21$ radians, which is equivalent to approximately $69.3^\circ$ .

Step-by-step explanation:

The angle between two vectors can be found from the ratio between:

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To be precise, if $\theta$ denotes the angle between $\vec{u}$ and $\vec{v}$ (assume that $0^\circ \le \theta < 180^\circ$ or equivalently $0 \le \theta < \pi$ ,) then:

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<h3>Dot product of the two vectors</h3>

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The dot product of $\vec{u}$ and $\vec{v}$ will thus be:

$\begin{aligned} \vec{u} \cdot \vec{v} = 5 \times 5 + (-8) \times1 = 17 \end{aligned}$ .

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Apply the Pythagorean Theorem to both $\vec{u}$ and $\vec{v}$ :

$\| u \| = \sqrt{5^2 + (-8)^2} = \sqrt{89}$ .
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