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 ‘t’ that measures how long it will take for both hands to be perpendicular to each other can be calculated by the following equation:

t ≈ 16.36 minutes

Virginia Mathematics Teacher vol. 44, no. 1

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