The greatest possible length which can be used to measure exactly the length 7m, 3m 85cm, 12 m 95 cm is
Required Length = H.C.F of 700 cm, 385 cm and 1295 c
= 35 cm.
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An observer 1.6 m tall is 203away from a tower. The angle of elevation from his eye to the top of the tower is 30º. The heights of the tower is:
Draw BE // CD
Then, CE = AB = 1.6 m,
BE = AC =
DEtan30=> DE = tan30 x 203=> DE = 13x203 = 20
Therefore, CD = CE + DE = (1.6 + 20) m = 21.6 m.
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