Answer :

Here, BN Lake


C Position of level


Clearly CN = C′N


I-Δ CAM




…(1)


In Δ AMC′



…(2)


From eq. (1) and (2)



h = 10 m


OR


AB Flag Staff (1 m)


BC Tower (20 m)


DC x(8ay)


Diagram


In Δ ADC,




…(1)


In Δ BDC



(2)


Fro, eq. (1) & (2)





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