Hudson, who is 3 feet tall, is on the beach flying a kite. His angle of elevation looking up to the kite is [tex]\(40^\circ\)[/tex]. The kite string is 125 ft long. How high is the kite off the ground?

Solution:
Make sure to draw your own picture if one is not given.

We are given the reference angle of [tex]\(40^\circ\)[/tex] and the hypotenuse (125 ft) and asked to find the opposite side, which is how high the kite is from the ground. We need to use the sine ratio. Let's set up our ratio first.

Solve for [tex]\(x\)[/tex] rounding to the nearest tenth.

[tex]\[
\sin(40^\circ) = \frac{x}{125}
\][/tex]

[tex]\[
x = 125 \cdot \sin(40^\circ)
\][/tex]

This represents the height of the kite from Hudson. In order to find the height of the kite from the ground, we must add Hudson's height (3 ft).

So, the kite is [tex]\(\boxed{\text{x} + 3}\)[/tex] ft above the ground.



Answer :

Alright, let's go through the problem step-by-step.

1. Understand the givens:
- Hudson's height is 3 feet.
- The angle of elevation from Hudson's eyes to the kite is 40 degrees.
- The length of the kite string is 125 feet.

2. Identify what you need to find:
- The height of the kite above Hudson.
- The total height of the kite above the ground.

3. Draw a right triangle:
- Hypotenuse: The length of the kite string, which is 125 feet.
- Angle: The angle of elevation, which is 40 degrees.
- Opposite side (x): The height of the kite above Hudson.

4. Use the sine ratio to find the height above Hudson:
- The sine function is defined as the ratio of the length of the opposite side to the hypotenuse in a right triangle.
- [tex]\(\sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}}\)[/tex]

5. Set up the equation using the sine function:
- [tex]\(\sin(40^\circ) = \frac{x}{125}\)[/tex]
- To solve for [tex]\(x\)[/tex]:
[tex]\[ x = 125 \times \sin(40^\circ) \][/tex]

6. Calculate [tex]\(x\)[/tex]:
- Using a calculator:
[tex]\[ x \approx 125 \times 0.6428 = 80.35 \text{ feet} \][/tex]

So, the height of the kite above Hudson is approximately 80.35 feet.

7. Add Hudson's height to find the total height above the ground:
- Hudson's height is 3 feet.
- Therefore, the total height of the kite above the ground:
[tex]\[ \text{Height from ground} = \text{Height from Hudson} + \text{Hudson's height} \][/tex]
[tex]\[ = 80.35 + 3 = 83.35 \text{ feet} \][/tex]

Thus, the height of the kite is approximately 83.35 feet above the ground.