Question

On her way to visit Horace Mann University, Casey stopped by Mount Rushmore in South Dakota. The park ranger gave a talk that described the history of the monument and provided some interesting facts. Casey could not believe that the carving of George Washington’s face is 60feet tall from his chin to the top of his head!

However, when a tourist asked about the length of Washington’s nose, the ranger was stumped! Casey came to her rescue by measuring, calculating and getting an answer.
How did Casey get an answer?

Answer 1

using a proportion relating nose length to head height

Explanation:

Casey measured the nose length, and found the fraction that was of the head height. Then Casey found the same fraction of 60 feet to find the actual nose length.

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Casey could use a photograph, poster, postcard, or a ruler held at arm's length, to make the necessary measurements.