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- The cactus casts a 9-foot shadow.
- The person, who is 11 feet tall, casts a 4-foot shadow.
We can set up the ratio of the heights to the lengths of the shadows because the triangles are similar. Let ( h ) be the height of the cactus. The proportion is:
[tex]\frac{\text{height of cactus}}{\text{shadow of cactus}} = \frac{\text{height of person}}{\text{shadow of person}}[/tex]
[tex]\frac{h}{9} = \frac{11}{4}[/tex]
[tex]4h = 9 \times 11[/tex]
[tex]4h = 99[/tex]
[tex]h = \frac{99}{4} = \boxed{24.75}[/tex]