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3 years ago

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A certain coin is a circle with diameter 18 mm. What is the exact area of either face of the coin? The exact årea of either face

of the coin is mm2. (Simplify your answer. Type an exact answer in terms of re.)

1 answer:

solniwko [45]3 years ago

7 0

I don't understand it sorry

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Vector question. Let v=<-2,1> u=<3,-5> , find:

lyudmila [28]

Answer:

1. ) $\vec {v}.\vec{u}= -11$

2.) The angle between v and u is 147.52°.

Step-by-step explanation:

Given:

$\vec {v}= ( -2 , 1 )\\\vec {u}= ( 3 , -5 )$

To Find:

1. $\vec {v}.\vec{u}= ?$

2. $\theta = ?$

Solution:

$\vec {v}.\vec{u}$ is scalar product given as,

$\vec {v}.\vec{u}=|\vec {v}||\vec {u}|\cos \theta$

$|\vec {v}|=|(-2, 1)|=\sqrt{(-2)^{2} +1^{2}}=\sqrt{5}\\|\vec {u}|=|(3, 5)|=\sqrt{(3)^{2} +(-5)^{2}}=\sqrt{34}$

$\vec {v}.\vec{u}=(-2i +j).(3i-5j)\\$

Here only i.i = j.j =1 and i.j = j.i = 0

∴ $\vec {v}.\vec{u}=(-2\times 3 +1\times -5)\\\vec {v}.\vec{u}=-6-5=-11 \\$

Now, Substituting the above values we get

$-11=\sqrt{5}\times \sqrt{34}\cos \theta\\ \cos \theta=\frac{-11}{\sqrt{170}} \\ \cos \theta =-0.84366\\\therefore \theta =cos^{-1}(-0.84366)\\\therefore \theta =147.52\°$

As it is negative mean $\theta$ is in Second Quadrant Because Cosine is negative in Second Quadrant.

1. ) $\vec {v}.\vec{u}= -11$

2.) The angle between v and u is 147.52°.

5 0

3 years ago

Question 4 options:

mojhsa [17]

ABC=2*4*3=24
....................

3 0

3 years ago

Read 2 more answers

Sides of a triangle are in the ratio of 12:17:25 and A perimeter of 540 cm. Find its area

sdas [7]

Nnnfnfnfkfjjfjcnfn djfvivide ficnd erig sofcjene

8 0

4 years ago

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

8_murik_8 [283]

Hey!

-----------------------------------------------

Solution:

= -2.1 + 0.3 + -1.7 + -0.4

= -1.8 + -1.7 + -0.4

= -3.5 + -0.4

= -3.9

-----------------------------------------------

Answer:

a) -3.9

-----------------------------------------------

Hope This Helped! Good Luck!

5 0

3 years ago

I lied the first time. This is the last problem lol.

viktelen [127]

Answer:

y=10

Step-by-step explanation:

A line is 180°

6x10=60

120+60=180

Hope this helps :)

6 0

3 years ago