If the sun's elevation increases from 45 ° to 60 °, the length of the shaft of a pillar decreases by 3 meters to determine the height of the pillar
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Let tan 45 = H / d1
tan 65 = H / d2
d1 tan 45 = d2 tan 65 = (d1 - 3) tan 65 since d2 = d1 - 3
d1 = (d1 - 3) * 2.14
d1 = 2.14 d1 - 6.43
1.14 d1 = 6.43 and d1 = 5.64
so H = 5.64 since 1 = H / d1 from the first equation
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