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Krithi ♀️
Subject: Maths
, asked on 9/5/18
value of sin 45 in decimals.
Answer
1
Raghav Singh
Subject: Maths
, asked on 30/3/18
Please answer q 16. I reached the cot ? tan point but can't solve it further. Please explain in brackets side by side.
16.
The angles of elevation of the top of a tower from two points at a distance of 4 m and 9 m from the base of the tower and in the same straight line with it are complimentary. Prove that the height of the tower is 6 m.
Please answer q 16. I reached the cot ? tan point but cant solve it further. Please explain in brackets side by side.
Answer
2
Son Ser
Subject: Maths
, asked on 30/3/18
Plzz fast i have exams
Q.
sin
θ
+
s
e
c
θ
2
+
cos
θ
+
cos
e
c
2
θ
=
1
+
s
e
c
θ
cos
e
c
θ
2
Answer
3
Raghav Singh
Subject: Maths
, asked on 29/3/18
In this i am getting opposite values of tan and cot. I am getting 4cotx & 9 tanx and also how are both of them equal to 36 ? -
19:23 Let AB be the tower. C and D be the two points with distance 4 m and 9 m from the base respectively. A/q, In right
AABC, tan x = AB/BC tan x = AB/4 AB = 4 tan x
(i) also, In right AABD, tan (900-x) = AB/BD cot x = AB/9 AB = 9 cot x
(ii) Multiplying eqn (i) and (ii) AB2 = 9 cot xx 4 tan x AB2 = 36
Height cannot be negative. Therefore, the height of the tower is 6 m. Hen Proved.
Answer
1
Mohit Sharma
Subject: Maths
, asked on 27/3/18
Problems of height and distance can be solved by more than one way . Is full marks are awarded for the correct answer of problem done in different approach which is in syllabus in boards ? Pls tell trm is my papaer
Answer
2
Champ Jee
Subject: Maths
, asked on 27/3/18
Solve this :
Q. An aeroplane, when flying at a height of 4000 m from the ground passes vertically above another
aeroplane at an instant when the angles of elevation of the two planes from the same point on the
ground are 60
o
and 45
o
respectively. Find the vertical distance between the aeroplanes at that instant.
Take
3
=
1
.
73
Answer
3
Anu
Subject: Maths
, asked on 26/3/18
Dear experts plzz clarify!!!!!
Answer
2
Riya
Subject: Maths
, asked on 26/3/18
Please do qs no. 27(i)
Q.27.(i)
1
+
cos
θ
+
sin
θ
1
+
cos
θ
-
sin
θ
=
1
+
sin
θ
cos
θ
Answer
1
Raghav Singh
Subject: Maths
, asked on 26/3/18
In this q what have we dine to PD in the last step. Is it rationalisation ?
Answer
1
Akshit Gupta
Subject: Maths
, asked on 26/3/18
Solve this:
Q.61. From the top of a 10 m high building, the angle of depression of the foot of a tower is 30
°
and the angle of elevation of top of the tower from the foot of the building is 60
°
. Find the distance between the tops of the building and the tower.
[Use
7
= 2.64]
Answer
1
अर्कज ..
Subject: Maths
, asked on 25/3/18
Q.15 A ladder against a vertical wall at an inclination
α
to the horizontal .The foot is pulled away from the wall through a distance p, so that its upper end slides a distance q down the wall and then the ladder makes an angle
β
to the horizontal . show that p /q =
cos
β
-
cos
α
/
sin
α
-
sin
β
Answer
1
Murugan
Subject: Maths
, asked on 25/3/18
A round balloon of radious 'a' ,subtends an angle Theeta at the eye of a observer while the angle of elevation of its centre is phi ..prove that the height of the centre of the balloon is = sin phi cosec theeta +2...
Answer
2
Khushi Jain
Subject: Maths
, asked on 25/3/18
The ratio of the height of a tower and the length of its shadow on the ground is
3
:
1
. What is the angle of elevation of the sun?
Answer
1
Prateek Kumar
Subject: Maths
, asked on 24/3/18
All questions please
Two stations due south of a leaning tower which leans towards the north are at distances a and b from its foot. If
α
a
n
d
β
be the elevations of the top of the tower from these stations, its inclination
θ
to the horizontal is given by cot
θ
is equal to
(
A
)
b
c
o
t
α
-
a
c
o
t
β
b
-
a
(
B
)
b
c
o
t
α
+
a
c
o
t
β
b
+
a
(
C
)
a
c
o
t
α
-
b
c
o
t
β
a
-
b
(
D
)
b
c
o
t
β
-
a
c
o
t
α
a
+
b
Answer
1
Ibtihal ..
Subject: Maths
, asked on 23/3/18
Solve this:
From the top of a 7 m high building, the angle of elevation of the top of a cable tower is
60
°
and the angle of depression of the foot of the tower is
30
°
. Find the height of the tower.
Answer
1
1
2
3
4
5
Next
What are you looking for?
16. The angles of elevation of the top of a tower from two points at a distance of 4 m and 9 m from the base of the tower and in the same straight line with it are complimentary. Prove that the height of the tower is 6 m.
Please answer q 16. I reached the cot ? tan point but cant solve it further. Please explain in brackets side by side.
Q.
19:23 Let AB be the tower. C and D be the two points with distance 4 m and 9 m from the base respectively. A/q, In right
AABC, tan x = AB/BC tan x = AB/4 AB = 4 tan x
(i) also, In right AABD, tan (900-x) = AB/BD cot x = AB/9 AB = 9 cot x
(ii) Multiplying eqn (i) and (ii) AB2 = 9 cot xx 4 tan x AB2 = 36
Height cannot be negative. Therefore, the height of the tower is 6 m. Hen Proved.
Q. An aeroplane, when flying at a height of 4000 m from the ground passes vertically above another
aeroplane at an instant when the angles of elevation of the two planes from the same point on the
ground are 60o and 45o respectively. Find the vertical distance between the aeroplanes at that instant.
Q.27.(i)
Q.61. From the top of a 10 m high building, the angle of depression of the foot of a tower is 30 and the angle of elevation of top of the tower from the foot of the building is 60. Find the distance between the tops of the building and the tower.
[Use = 2.64]
Two stations due south of a leaning tower which leans towards the north are at distances a and b from its foot. If be the elevations of the top of the tower from these stations, its inclination to the horizontal is given by cot is equal to
From the top of a 7 m high building, the angle of elevation of the top of a cable tower is and the angle of depression of the foot of the tower is . Find the height of the tower.