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3 years ago

Find the exact value of cos 45º in simplest form with a rational denominator.

Mathematics

1 answer:

goldenfox [79]3 years ago

8 0

Answer:

$\frac{\sqrt{2} }{2}$

Step-by-step explanation:

Cos is Adjacent over Hypotenuse, (see picture below)

x/xsqrt(2)

1/sqrt(2)

sqrt(2)/2

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OleMash [197]

Answer:

Step-by-step explanation:

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2 years ago

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monitta

Answer:

10 sides.

Step-by-step explanation:

Two same interior angles + 72 degrees = 360.

Thus, the interior angle of the polygon is $\frac{360-72}{2} =144$ .

The formula to find the interior angle of a polygon is $\frac{180(n-2)}{n}$

$\frac{180(n-2)}{n} =144$

Multiply both sides by n:

$\frac{180\left(n-2\right)}{n}n=144n$

$180\left(n-2\right)=144n$

Expand:

$180n-360=144n$

Add 360 to both sides:

$180n-360+360=144n+360$

$180n=144n+360$

Subtract 144n from both sides:

$180n-144n=144n+360-144n$

$36n=360$

Divide both sides by 36:

$\frac{36n}{36}=\frac{360}{36}$

$n=10$

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2 years ago

Please answer the question in the picture.

ASHA 777 [7]

Answer:

C.) The relationship is proportional

Step-by-step explanation:

If D is true, then it is not proportional, constants of proportionality must not include multuplting or subtracting from anything.

Also quick way to tell— the line doesn’t start from 0,0

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BigorU [14]

Answer:

1. tan (4π/3) = √3

Answered by GAUTHMATH

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2 years ago

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Alisiya [41]

Answer:

Step-by-step explanation:

36+36=72

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Find the exact value of cos 45º in simplest form with a rational denominator.​

Find the exact value of cos 45º in simplest form with a rational denominator.