A right triangle has a hypotenuse of length 40 and an angle of 25 degrees, with a side opposite this angle of length 16. A second right triangle also has an angle of 25 degrees, with a hypotenuse of length 10. Determine the length of the side opposite the 25 degrees angle on the second triangle.

1 answer

To find the length of the side opposite the 25-degree angle in the second triangle, we can use the relationship between the side lengths and the angles in a right triangle.

In a right triangle, given an angle \(\theta\) and the length of the hypotenuse \(c\), the length of the side opposite the angle can be calculated using the sine function: \[ \text{opposite} = c \cdot \sin(\theta) \]

For the second triangle, we have:

  • The hypotenuse \(c = 10\)
  • The angle \(\theta = 25\) degrees

Therefore, the length of the side opposite the 25-degree angle in the second triangle is: \[ \text{opposite} = 10 \cdot \sin(25^\circ) \]

Now, we can calculate \(\sin(25^\circ)\). Using a calculator: \[ \sin(25^\circ) \approx 0.4226 \]

Substituting this value into the equation: \[ \text{opposite} \approx 10 \cdot 0.4226 = 4.226 \]

Thus, the length of the side opposite the 25-degree angle in the second triangle is approximately: \[ \boxed{4.23} \]