Math Problem Statement

Find the value of x in the right triangle with an adjacent side of 13 units and an angle of 16 degrees, rounded to the nearest tenth.

Solution

To find the value of xx in the given right triangle, we can use trigonometric ratios. The triangle has a right angle, a known side (13, which is adjacent to the angle), and an angle of 16 degrees. The side xx is the hypotenuse.

Using the cosine ratio, which relates the adjacent side and the hypotenuse in a right triangle, we have:

cos(angle)=adjacenthypotenuse\cos(\text{angle}) = \frac{\text{adjacent}}{\text{hypotenuse}}

Plugging in the known values:

cos(16)=13x\cos(16^\circ) = \frac{13}{x}

To find xx, rearrange the equation:

x=13cos(16)x = \frac{13}{\cos(16^\circ)}

Now, calculate the value using a calculator:

  1. Find cos(16)\cos(16^\circ).
  2. Divide 13 by this cosine value.

x=13cos(16)130.961313.5x = \frac{13}{\cos(16^\circ)} \approx \frac{13}{0.9613} \approx 13.5

Thus, the value of xx to the nearest tenth is 13.5.

Would you like more details or have any questions?

Here are 5 related questions that build on this topic:

  1. How would you find the length of the opposite side in this triangle?
  2. What trigonometric ratio would you use if you were given the opposite side and the hypotenuse?
  3. How can you verify that your calculated hypotenuse value is correct?
  4. What is the sine of 16 degrees, and how could it be used to solve for a side in this triangle?
  5. How would the calculation change if the angle were given as 74 degrees instead?

Tip: When solving right triangle problems, always identify which sides are adjacent, opposite, and the hypotenuse relative to the given angle. This will help you choose the correct trigonometric function to use.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Right Triangles

Formulas

cos(θ) = adjacent/hypotenuse

Theorems

Trigonometric Ratios

Suitable Grade Level

Grades 8-10