Chapter 13: Q11. (page 706)

Solve triangle ABC using the given measurements if $b = 7, C = 90 {}^{\circ}{and} c = 18$ . Round measure of sides to the nearest tenth and angles to nearest degree.

Short Answer

Expert verified

The solution for triangle ABC is $a = 16.6, A = 67 {}^{\circ}{and} B = 23 °$ .

Step by step solution

Step 1. Write down the given parameters of triangle.

The given triangle ABC is shown below whose parameters are represented as $b = 7, C = 90 {}^{\circ}{and} c = 18$ .

Step 2. Calculation.

In triangle ABC, $b = 7, C = 90 {}^{\circ}{and} c = 18$ .

Now, in right triangle ABC,

$\begin{matrix} c^{2} = a^{2} + b^{2} gives, \\ 18^{2} = a^{2} + 7^{2} \\ a^{2} = 18^{2} - 7^{2} \\ a = 5 \sqrt{11} \\ a = 16.6 \end{matrix}$

Now by trigonometric ratios,

$\begin{matrix} \cos B = \frac{a}{c} \\ \cos B = \frac{16.6}{18} \\ B = \cos^{- 1} (\frac{16.6}{18}) \\ B = 23 ° \end{matrix}$

Now, $C = 90 {}^{\circ}{and} B = 23 °$ , therefore by angle sum property $A = 67 °$ .

Step 3. Conclusion.

Thesolution for triangle ABC, is $a = 16.6, A = 67 {}^{\circ}{and} B = 23 °$ .

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Solve triangle ABC using the given measurements if $b = 7, C = 90 {}^{\circ}{and} c = 18$ . Round measure of sides to the nearest tenth and angles to nearest degree.

Short Answer

Step by step solution

Step 1. Write down the given parameters of triangle.

Step 2. Calculation.

Step 3. Conclusion.

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Solve triangle ABC using the given measurements if b=7,C=90and∘c=18. Round measure of sides to the nearest tenth and angles to nearest degree.

Short Answer

Step by step solution

Step 1. Write down the given parameters of triangle.

Step 2. Calculation.

Step 3. Conclusion.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Mechanics Maths

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Study anywhere. Anytime. Across all devices.

Solve triangle ABC using the given measurements if $b = 7, C = 90 {}^{\circ}{and} c = 18$ . Round measure of sides to the nearest tenth and angles to nearest degree.