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umka21 [38]
3 years ago
10

The equation cos−1 = x can be used to determine the measure of angle BAC.

Mathematics
2 answers:
Sergio [31]3 years ago
5 0

we know that

in the right triangle ABC

the value of cosine of angle x is equal to

cos(x)=\frac{AC}{AB}

we have

AC=3.4\ cm\\AB=10\ cm

substitute the values

cos(x)=\frac{3.4}{10}=0.34

Find the measure of angle x

x=cos(x)^{-1} =arc\ cos(0.34)=70.12\°

Round to the nearest whole degree

x=70\°

therefore

<u>the answer is</u>

70\°


9966 [12]3 years ago
3 0

The value of \boxed{\angle BAC=x=70^\circ } .

Further explanation:

Given:

The given right angle triangle is \Delta ABC .

The length of AC  is  3.4{\text{ cm}}, the length of AB  is {\text{10 cm}}  and \angle BAC=x .

Step by step explanation:

Step 1

Now the base of \Delta ABC  is AC  and the hypotenuse is AB  corresponds to angle x .

The value of cosine of angle x  can be represented as,

\cos\left(x\right)=\frac{{AC}}{{AB}}                                                                              ……(1)

Since the values are AC=3.4{\text{ cm, }}AB=10{\text{ cm}} .

Now substitute the values AC=3.4{\text{ cm, }}AB=10{\text{ cm}}  in equation (1).

\begin{aligned}\cos\left(x\right)&=\frac{{3.4}}{{10}}\\&=0.34\\\end{aligned}

Step 2:

Now find the inverse of the cosine to obtain the value of x  as,

  \begin{gathered}x={\cos^{-1}}\left({0.34}\right)\hfill\\x=70.12^\circ\hfill\\\end{gathered}

Step 3:

Now round the value of x  to the nearest whole degree.

   x=70^\circ

Therefore, the value of \angle BAC=x=70^\circ .

Learn more:

  • Learn more about the cost of   coffee cans <u>brainly.com/question/1576882 </u>
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Answer details:

Grade: High school

Subject: Mathematics

Chapter: Trigonometry

Keywords: Cosine function, sine function, equation, inverse, angle, round, whole degree, value, trigonometry, right angle triangle, perpendicular, base, hypotenuse

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