Use the tangent ratio to solve for missing side length AB of the right triangle. Round to the nearest hundredths

C is 26 degrees
BC is 15 inches
B is 90 degrees
What is AB?

1 answer

In a right triangle, the tangent of an angle is defined as the ratio of the length of the opposite side to the length of the adjacent side. In this case, you want to find the length of side AB (the side opposite angle C) using the given information.

Given:

  • Angle C = 26 degrees
  • Side BC (adjacent to angle C) = 15 inches
  • Angle B = 90 degrees

The tangent ratio can be expressed as:

\[ \tan(C) = \frac{\text{opposite}}{\text{adjacent}} \]

Substituting the known values:

\[ \tan(26^\circ) = \frac{AB}{BC} \]

where:

  • \( AB \) is the opposite side,
  • \( BC \) is the adjacent side (15 inches).

Now plug in the values:

\[ \tan(26^\circ) = \frac{AB}{15} \]

To find \( AB \), we can rearrange this equation to:

\[ AB = 15 \cdot \tan(26^\circ) \]

Next, we can use a calculator to find \( \tan(26^\circ) \):

\[ \tan(26^\circ) \approx 0.4877 \]

Now calculate \( AB \):

\[ AB \approx 15 \cdot 0.4877 \approx 7.315 \]

Rounded to the nearest hundredths, the length of AB is:

\[ \boxed{7.32} \text{ inches} \]