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Taya2010 [7]
3 years ago
8

Given tan θ = 3/4 for acute angle θ, find the value of a and b for the statement cos θ = a/b.

Mathematics
1 answer:
Furkat [3]3 years ago
6 0

Step-by-step explanation:

\tan \theta =  \frac{3}{4}  \\  \\ \sec \theta =  \sqrt{1 +  { \tan }^{2} \theta}  \\  \hspace{22 pt} =  \sqrt{1 +  {( \frac{3}{4}  )}^{2} }  \\  \hspace{22 pt} =  \sqrt{1 +  {\frac{9}{16}  }}  \\ \hspace{22 pt} =  \sqrt{ {\frac{16 + 9}{16}  }}  \\  \hspace{22 pt} =  \sqrt{ {\frac{25}{16}  }}  \\ \red{  \boxed{\bold{ \therefore  \sec \theta  =  { {\frac{5}{4}  }} }}} \\  \\ \cos \theta  = \frac{1}{\sec \theta  }  =  \frac{4}{5}  =  \frac{a}{b}  \\   \\ \implies \: a = 4 \: and \: b = 5

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Can someone help with the two triangle questions (will mark brainliest!!)
yaroslaw [1]

Answer: Number 1 is c=89 ft

Number 2 is b=3 cm

Step-by-step explanation: a²+b²=c²

For number 1, 39 ft is a and 80 ft is b so

39²+80²=c² so 39² is 39x39=1521 and 80² is 80x80=6400 so 6400+1521=7921

7921=c² and the square root of 7921 is 89 so c=89 ft

For number 2, a=1.6 cm and c=3.4 cm so 3.4²-1.6²=b²

3.4² so 3.4x3.4 which is 11.56

1.6² so 1.6x1.6 which is 2.56

11.56-2.56=c² and 11.56-2.56=9

Square root of 9 is 3 so b=3

So number 2 answer is b=3 cm

I hope this helps

4 0
2 years ago
1/3 of 3/4 = ____ fourth(s)
SashulF [63]

Answer:

0.99

Step-by-step explanation:

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6 0
2 years ago
NEED HELP!!!
lana [24]

Answer:

We will choose option D.

Step-by-step explanation:

In the given diagram the shown right triangle has Base = 3 units, Perpendicular = 4 and the Hypotenuse = 5 units,

Now, in option A.

The vertices of the triangle are (-3,-3), (-3,4) and (4,-3).

Hence, the side lengths of the triangle are 7 units, 7 units, and 7√2 units.

So, it is not similar to the graphed triangle.

{Since, the ratio of corresponding sides of the similar triangles are the same}

Now, in option B.

The vertices of the triangle are (-3,-3), (-3,5) and (4,-3).

Hence, the side lengths of the triangle are 7 units, 8 units, and 10.63 units.

So, it is not similar to the graphed triangle.

Now, in option C.

The vertices of the triangle are (-3,-3), (-3,4) and (3,-3).

Hence, the side lengths of the triangle are 6 units, 7 units, and 9.21 units.

So, it is not similar to the graphed triangle.

Now, in option D.

The vertices of the triangle are (-3,-3), (-3,5) and (3,-3).

Hence, the side lengths of the triangle are 6 units, 8 units, and 10 units.

So, it is similar to the graphed triangle.  

This is because the ratio of the corresponding sides of the given triangle and the graphed triangle are same and it is 2.(Answer)

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2 years ago
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murzikaleks [220]
I would use the inverse operation.
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