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nadya68 [22]
2 years ago
8

PLEASE SOMEONE HELP ME

Mathematics
2 answers:
lilavasa [31]2 years ago
8 0

Answer: <em>50°</em>

Step-by-step explanation:

<em>Remember a straight line must equal 180°</em>

<em>So all angles on the line must add up to 180°</em>

<em>So let's take our given angles of 65° and add them together</em>

<em>65°+65°=130°</em>

<em>Now let's take 180°-130°=</em><em>50°</em>

Hitman42 [59]2 years ago
5 0

Answer:

50

Step-by-step explanation:

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Read 2 more answers
Given the diagram below, what is cos(45*)? <br><br> A.<br><br><br> B.<br><br><br> C.<br><br><br> D.
alina1380 [7]

Answer:

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Step-by-step explanation:

To find cos 45° we must first find the adjacent and the hypotenuse

Let the adjacent be x

Let the hypotenuse be h

To find the adjacent we use tan

tan ∅ = opposite / adjacent

From the question

the opposite is 9

So we have

tan 45 = 9 / x

x tan 45 = 9

but tan 45 = 1

x = 9

Since we have the adjacent we use Pythagoras theorem to find the hypotenuse

That's

h² = 9² + 9²

h² = 81 + 81

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h = √162

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Now use the formula for cosine

cos∅ = adjacent / hypotenuse

The adjacent is 9

The hypotenuse is 9√2

So we have

cos 45 = 9/9√2

We have the final answer as

<h3 /><h3>cos 45 = 1 / √2</h3>

Hope this helps you

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