Chapter 8, Problem 30RP

To determine

To calculate: The increase in the length of the shadow.

Answer to Problem 30RP

The increase in length of the shadow will be 8 ft.

Explanation of Solution

Given information:

L is 5 ft long and is standing in the light of 15 ft lamppost

Her shadow is 4 ft long

Formula used:

Compare the sides of triangles formed and use ratios of corresponding sides are equivalent

Calculation :

Let x be the increase in shadow

From the question, we have

  $\begin{array}{l}\frac{5}{15}=\frac{4}{4+x}\\ \Rightarrow x=8\text{ ft}\end{array}$