fall-2017-final
Solutions to Spring 2017 HEXA Challenge Problems
Figure 2 .
Figure 3.
Figure 4.
Circular Shadow
Square Shadow
Triangular Shadow
September Challenge: It is currently midnight. How long is it until the minute hand and the hour hand are perpendicular to each oth- er?
SOLUTION: The speed of rotation of the hour hand is
The speed of rotation of the minute hand is
Since both hands start moving at 12:00, the time interval âtâ that measures how long it will take for both hands to be perpendicular to each other can be calculated by the following equation:
t â 16.36 minutes
Virginia Mathematics Teacher vol. 44, no. 1
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