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Drupady [299]
3 years ago
15

Find ????⋅ ???? if |????|=3 , |????|=9 , and the angle between ???? and ???? is π2 radians.

Mathematics
1 answer:
mrs_skeptik [129]3 years ago
5 0

Answer:

a{\cdot}b=0

Step-by-step explanation:

It is given that,

Magnitude of a A, |A|=3

magnitude of B, |B|=9

The angle betwern a and b is \dfrac{\pi}{2}\ rad=90^{\circ}

Dot product,

a{\cdot} b=|a||b|\ \cos\theta\\\\a{\cdot} b=3\times 9\times \ \cos(90)\\\\a{\cdot} b=0

So, a.b is equal to 0.

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The answer is below
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simplify and integrate to get y alone don't forget to tack on c with your indefinite integral

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One way to build stairs is to attach triangular blocks to an angled support, as shown at the right. If the support makes a 32°
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3 years ago
A straight road crosses two parallel railway tracks. The angle between the road and the
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<h3>Answer:  95 degrees</h3>

=======================================================

Explanation:

I recommend drawing it out to see what's going on. See the drawing below.

In the diagram, both angles are in the northeast corner of their four-corner configurations. They are both congruent corresponding angles. So that's why the second angle is also 95 degrees.

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