A Semicircular Arch for a Tunnel Under a River Has $12 \sqrt { 11 }$

question 28

Multiple Choice

A semicircular arch for a tunnel under a river has a diameter of 80 feet (see figure) . Determine the height of the arch 4 feet from the edge of the tunnel.

• A)36 feet
• B) \(12 \sqrt { 11 }\) feet
• C) \(4 \sqrt { 19 }\) feet
• D) \(4 \sqrt { 399 }\) feet
• E) \(6\) feet

---

Definitions:

Counterclockwise

A direction opposite to the way in which the hands of a clock move.

Perceptual Equivalence

The phenomenon where stimuli of different physical properties are perceived as identical or having the same meaning by the observer.

Mental Images

Visual representations created by the brain for simulation and recall of experiences, objects, or concepts.

Mental Processes

Internal, covert activities of our minds, such as thinking, feeling, and problem-solving.