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kicyunya [14]
3 years ago
6

Can someone help I don’t understand this!?

Mathematics
2 answers:
vaieri [72.5K]3 years ago
8 0

Answer:

to do this you need to know that cos= adjacent/hypotenous.

Therefore your answer would be cos55=12/x

Step-by-step explanation:

alexira [117]3 years ago
5 0

Answer:

A

Step-by-step explanation:

Let's label what we currently have:

Hypotenuse = x

Opposite = 12

Adjacent = ?

Since the answer choices are asking us to use cosine, we will need to use the cosine formula:

cos=\frac{adjacent}{hypotenuse}

It seems like we don't have the adjacent side yet. However, if we use another angle, we can find out what x is. We know one angle is 35°. Since it is a right triangle, the other angle is 90°. Since all triangles add up to 180°, we know that the other angle is 55°. We CAN use cosine to find x if we use the 55° angle.

Let's label our new areas:

Hypotenuse=x

Opposite=?

Adjacent=12

By using the cosine formula, we can now use the two values we have in the equation.

cos 55=\frac{12}{x}

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