In triangle ABF, AF = 5 (Pythag.)
Triangle AJE is similar to triangle ABF
So AJ/AE = AB/AF = 4/5
So AJ = 2.4
Similarly AK = 3.2
and EJ = 1.8
and BK = 2.4
(etc.)

THIS MONTH'S QUIZ

A warning sign in the form of an equilateral triangle stands vertically on level ground with its base aligned due East-West. Find the three angles of the triangle formed by the sign's shadow in the following cases:

1. When the sun is due South at an altitude of 60^{o}.

2. When the sun is due South-West at an altitude of 45^{o}.