A tree casts a shadow that is 22 meters long. The angle of elevation from the end of the shadow to the top of the tree is 83°. Find the distance from the top of the tree to the end of the shadow.

1 answer

To find the distance from the top of the tree to the end of the shadow, we can use trigonometry. We will consider the situation as a right triangle where:

  • The distance of the shadow (22 m) is the adjacent side.
  • The height of the tree (which we want to find) is the opposite side.
  • The distance from the top of the tree to the end of the shadow will be the hypotenuse.

Let \( h \) be the height of the tree. The angle of elevation from the end of the shadow to the top of the tree is given as \( 83^\circ \).

We can use the following trigonometric relationships:

  1. The tangent of the angle relates the opposite side (height of the tree) to the adjacent side (length of the shadow): \[ \tan(83^\circ) = \frac{h}{22} \]

We can rearrange this to find \( h \): \[ h = 22 \cdot \tan(83^\circ) \]

  1. To find the hypotenuse \( d \) (the distance from the end of the shadow to the top of the tree), we can use the cosine function: \[ \cos(83^\circ) = \frac{22}{d} \]

Rearranging for \( d \): \[ d = \frac{22}{\cos(83^\circ)} \]

Now we can calculate \( h \) and \( d \).

Step 1: Calculate \( h \)

Using a calculator to find \( \tan(83^\circ) \): \[ \tan(83^\circ) \approx 9.514 \] So, \[ h \approx 22 \cdot 9.514 \approx 209.308 \text{ meters} \]

Step 2: Calculate \( d \)

Now we find \( d \): Using a calculator to find \( \cos(83^\circ) \): \[ \cos(83^\circ) \approx 0.094 \] So, \[ d \approx \frac{22}{0.094} \approx 234.042 \text{ meters} \]

Thus, the distance from the top of the tree to the end of the shadow is approximately: \[ \boxed{234.04 \text{ meters}} \]