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Vesnalui [34]
3 years ago
15

Cos ■ = 7/14A. 39°B. 30° C. 26.57°D. 60°​

Mathematics
1 answer:
dolphi86 [110]3 years ago
4 0

Option D:

$\cos60^\circ=\frac{7}{14}

Solution:

Given data:

$\cos -- = \frac{7}{14}

Let the unknown degree be x.

To find the degree x:

$\cos x = \frac{7}{14}

Cancel the common factor 7 in the numerator and denominator.

$\cos x = \frac{1}{2}

Using trigonometry basic formula,

we know that \cos60^\circ = \frac{1}{2}.

So, x = 60°.

The unknown degree measure is 60°.

$\cos 60^\circ= \frac{7}{14}

Hence option D is the correct answer.

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