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A 7 m long flagstaff is …

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A 7 m long flagstaff is fixed on the top of a tower standing on the horizontal plane. From point on the ground, the angels of elevation of the top and bottom of the flagstaff are 60° and 45° respectively. Find the height of the tower correct to one place of decimal. (√3=1.73)

Posted by Aki Jain 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Nitin Dadhich 6 years, 10 months ago

Let AB is flagstaff=7m, BC is tower=x m, CD is distance between tower and the point=y m. Tan45°= BC/CD Tan45°= x/y 1=x/y x=y ...........(i) Tan60°= AC/CD Tan60°= AB+BC/CD √3= 7+x/y From (i) equation. √3= 7+y/y y√3= 7+y y√3-y=7 y(√3-1)= 7 Solve it and find value of y then from (i) eauation x=y So you get value of x ??Smart question

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