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zavuch27 [327]
3 years ago
14

Given that sin A = 1/3 and angle A is in the first quadrant, find cos A

Mathematics
2 answers:
olya-2409 [2.1K]3 years ago
7 0
Hope this helps you.

scoundrel [369]3 years ago
3 0
Sin A = opposite / hypotenuse 

If angle A is in the first quadrant, that means both x and y coordinate are positive.

Now you can draw triangle. Since sinA = 1/3, opposite side may be 1, so then hypotenuse side must be 3.

Now you can use Pythagorean Theorem to solve for the length of adjacent side:

a² + b² = c²
1 + b² = 9
b² = 8
b = 2√2

So adjacent side is 2√2.

So now we can solve for cosA:

cosA = adjacent / hypotenuse = 2√2 / 3

Final answer: 2√2 / 3
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Using the equation y = 2x + 5, what would the input need to be for an output of -15?
vfiekz [6]

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x = -10

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A) Move all terms to the left side and set equal to zero. Then set each factor equal to zero.

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3 years ago
What is the surface area of the triangular prism?
stepladder [879]

Answer:

<h2>135 ft²</h2><h2 />

Step-by-step explanation:

surface area = bh + L(s1 + s2 + s3)

where b = 2.5 ft.

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6 0
3 years ago
IN triangle ABC point D is the centroid and BD=4 Find BE
valentinak56 [21]

Answer:

2

Step-by-step explanation:

What is so special about the centroid? It is the distinct point that each of the three medians intersect. Therefore, from this definition we can figure out through some geometric proof (I'm not going to go into this) the following:

If you draw the medians, you will notice that they intersect at exactly one point. That is the centroid. You will also notice that the centroid splits the median into 2 parts: top and bottom. The proof suggests that the top part is 2 times the bottom part.

In this case, the centroid is D and the top point is B. Therefore, we can figure out that BD, the top part, must be 2 times the bottom part, which is BE. Thus, we determine that BE is 2 because 4/2 = 2.

I would encourage you to draw it out so you can understand. Unfortunately, typing may not work all the time

4 0
3 years ago
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