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CBSE Class 10 Answered

A 1.6m tall girl stands at a distance of 3.2m from a lampost and casts a shadow of 4.8m on the ground. Find the height of the lampost by using(1)trigonometric ratios(2)property of similar triangles.
Asked by dr.geetanjali.p | 02 Sep, 2019, 11:29: AM
answered-by-expert Expert Answer
PQ rightwards arrow post AB rightwards arrow girl Trigonometric space ratios in space increment ABR tanθ equals fraction numerator 1.6 over denominator 4.8 end fraction in space increment PQR tanθ equals straight x over 8 so fraction numerator 1.6 over denominator 4.8 end fraction equals straight x over 8 straight x equals 2.67 space straight m space left parenthesis approx right parenthesis Similarity increment PQR tilde increment ABR space... open parentheses AA space test close parentheses angle straight Q equals angle ABR equals 90 degree angle straight R space common so PQ over QR equals AB over BR... left parenthesis straight c. straight p. straight s. straight t right parenthesis straight x over 8 equals fraction numerator 1.6 over denominator 4.8 end fraction straight x equals 2.67 space straight m space left parenthesis approx right parenthesis
Answered by Arun | 02 Sep, 2019, 04:30: PM

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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
the angle of elevation of a cloud from a point h metre above a lake is theta. the angle of depression of its reflection in the lake is 45 degree. Find the height of the cloud
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CBSE 10 - Maths
a fire in the building Bis reported on telephone to two fire staitons P and Q, 20 km apart from each other on a straight road P observes that the fire is at an angle of 60 degree to the road and Q observes that it is at an angle of 45 degree to the road. What station should send its team and how much time will this team have to travel?
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CBSE 10 - Maths
from a point on the ground the angles of elevation of the bottom and top of a communication tower fixed on the top of a 20 meter high building a 45 degree and 60 degree respectivelyf.find the height of the tower.
Asked by ahmadaarif199 | 24 Jul, 2020, 02:58: PM
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