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From a point on the ground, …

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From a point on the ground, the angles of elevation of the bottom and the top of a transmission tower fixed at the top of a 20m high building are 45 degree and 60 degree respectively. Find the height of the tower.

Posted by Prachi Shukla 4 years, 7 months ago

CBSE > Class 10 > Mathematics

5 answers

Prachi Shukla 4 years, 7 months ago

Thank you

Himanshu Pandey 4 years, 7 months ago

????? ??? ?? ??? ???? ??? ???? ?? ???? ????? ??? ??? ???? ???? ?? ?? ????? ????? ?? ???..

Himanshu Pandey 4 years, 7 months ago

✓?? ???? ?

Himanshu Pandey 4 years, 7 months ago

??? ??? ?????? ?? ????? =? »?? ???????? ???, »???45=??/?? »1/1=20/?? (?? ????? ????????) »??=20? »?? ???????? ???, »???60=??/?? »✓3/1=20+?/20 (?? ????? ,,,,,,) »20✓3=20+? »20✓3-20=? »20(✓3-1)=? »?????? ?? ??? ????? =? »20(✓3-1)? ???.

Khushi 4 years, 7 months ago

Let DC be the tower and BC be the building. Then,CAB=45°,DAB=60°,BC=20m Let height of DC=hm In∆ABC, tan 45°= BC/AB = 1=20/AB =AB=20m, In right∆ABD, tan 60°= BD/AB =√3=h+20/20 = h=20(√3-1)m

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