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## angle

Asked by 12th February 2009 9:39 PM

## If cos theta - sin theta = root 2 sin theta , then what is the value of cos theta + sin theta ? root 2 cos (theta /2)  (cosec theta) /2 sin theta cos theta    Answer :- cos theta = root2 sin theta + sin theta           => cos theta =  sin theta ( root 2 + 1 )          => cos theta = sin theta ( root 2 +1) (root 2 -1 ) / (root 2 -1 )           => cos theta = sin theta [ (root 2)^2 - 1] / root2 -1          => costheta (root 2 -1) = sin theta (2-1)          => root 2 costheta - cos theta = sintheta           => root 2 costheta = sin theta + cos theta  -----ans    But there is no option .

Asked by sucharitasahoo1 26th December 2017 5:46 PM

## Two poles AB and PQ are standing opposite each other on either side of a road 200 m wide. From a point R between them on the road, the angles of elevation of the top of the poles AB and PQ are 45o and 40o respectively. If height of AB = 80 m, find the height of PQ correct to the nearest metre.

Asked by Shreya 15th February 2018 1:20 PM

## Plz solve Q8 (a)

Asked by Jatinaa786 16th February 2018 2:00 PM

## A person stand on a tower and he found a car after 12 minut the angel of elevation increase 30 to 45 find the time in that car  reach to tower

Asked by Ak9639315541 21st February 2018 8:52 PM

## A boy 1.6m tall is 20m away from a tower and observes the angle of elevation of the top of the tower to be (I) 45° (2) 60°. Find the height of the tower in each case.

Asked by raialbert14079 11th March 2018 8:45 AM

## from a boat 300m away from a vertical cliff, theangle of elevation of the top and the foot of a vertical concrete pillar at the age of cliff are55degree 40 min  and 54 degree 20min  respectiely find the height of the pillar correct to the nearest metre.explain the meaning please?

Asked by ipranjal01 17th April 2018 12:56 PM

## how to caalculate nearest metre and nearest centimetre of a number in heights and distance

Asked by ipranjal01 24th April 2018 2:20 PM

## HEIGHT AND DISTANCE A person standing on the bank of a river observes that the angle of elevation of the top of the tree standing on the opposite bank is 60degree. when he moves 40m away from the bank, he finds the angle of elevation to be 30degree. Find: 1)the height of the tree, correct to two decimal places, 2)the width of the river

Asked by prakruthi460 29th April 2018 5:53 PM

## a boy standing at a distance of 48 meters  from a building observe top of building and makes an angle of 30 degree find height of building

Asked by pinakdange1621 1st June 2018 9:01 PM

## Prove that

Asked by Anish 11th July 2018 1:27 PM

## Q.3

Asked by 1784393325200864 12th July 2018 3:53 PM

## Q4

Asked by 1784393325200864 12th July 2018 4:01 PM

## from a ship mast head 100m the angle of dpression of a boat is tan inverse of 5 12 Then its distance from the ship is

Asked by mokshithreddy125 23rd July 2018 7:31 PM

## A laddel of 15 m long Reaches a window which is 9m above the ground on one side of a street. Keeping it's foot at the same point, the ladder is turned to other side of the street to reach a window of 12m high. Find the width of the street

Asked by aniketbagree693aniketbagree693 23rd October 2018 4:01 PM

## To observes are 1 km apart in the same vertical plane as the balloon but on opposite side of it formed angles of elevation to be 60 degree and 45 degree how is the one above the ground

Asked by Rekhachandrekumar12 29th October 2018 8:08 PM