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Cd Kushan
Subject: Maths
, asked on 17/1/18
Can u explain
Q. In
∆
ABC, by Pythagoras Theorem, A
⇒
AB
2
= AC
2
– BC
2
⇒
AB
2
= (AP + PC)
2
–BC
2
⇒
AB
2
= (AB + PC)
2
–BC
2
⇒
AB
2
= (AB + 8 cm)
2
– (16 cm)
2
⇒
AB = 12 cm
Answer
3
Sweathaa
Subject: Maths
, asked on 16/1/18
What does underline symbol means ?
Answer
2
Komal Gupta
Subject: Maths
, asked on 15/1/18
18
Q18.) Prove that the intercept of a tangent between two parallel tangents to a circle subtends a right angle at the centre.
Answer
2
Sara
Subject: Maths
, asked on 14/1/18
Q 21
Answer
1
Shrish Vaidya
Subject: Maths
, asked on 10/1/18
Q). In Fig. 2, AB is the diameter of a circle with centre O and AT is a tangent. If
∠
A
O
Q
=
58
°
, find
∠
A
T
Q
.
Answer
2
Suyash Jain
Subject: Maths
, asked on 10/1/18
Solve this:
Q.1. In the given figure, PQ is a chord of a circle with centre O and PT is a tangent. If
∠
Q
P
T
=
60
°
, find
∠
P
R
Q
.
Answer
3
Suyash Jain
Subject: Maths
, asked on 10/1/18
Solve this:
Q.1. In the given figure, PQ is a chord of a circle with centre O and PT is a tangent. If
∠
Q
P
T
=
60
°
, find
∠
P
R
Q
.
Answer
2
Suyash Jain
Subject: Maths
, asked on 10/1/18
Q.21. A compound a (Molecular formula =
C
2
H
4
O
2
reacts with Na metal to form a compound B and evalves a gas which burns with a pop sound. Compound A on treatment with an alcohol C in the presence of an acid. Forms a sweet smelling compound D (molecular formula =
C
3
H
6
O
2
). B is also produced on addition of NaOH to A. D on treatment with NaOH solution gives back B and C. Identify A, B, C and D and write down the reactions involved.
Answer
3
Payal Arora
Subject: Maths
, asked on 9/1/18
7.
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F
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,
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m
m
o
n
tan
g
e
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a
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C
D
t
o
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e
t
w
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i
r
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e
s
w
i
t
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c
e
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t
e
r
s
O
1
a
n
d
O
2
i
n
t
e
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s
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c
t
a
t
E
.
p
r
o
v
e
t
h
a
t
A
B
=
C
D
.
Answer
1
Charulatha
Subject: Maths
, asked on 8/1/18
In figure 4, a triangle ABC is drawn to circumscribe a circle radius 3 cm, such that the segments BD and DC are respectively of lengths 6 cm and 9 cm. If the area of triangle ABC is 54 cm^2, then find the lengths of side AB and AC.
Answer
2
Prakhar
Subject: Maths
, asked on 6/1/18
Q. A chord of a circle 14 cm subtends an angle of 120
°
at the centre. find the area of the corresponding minor segment of the circle.
Q. In Figure 5, a triangle PQR is drawn to circumscribe a circle of radius 6 cm such that the segments QT and TR into which QR is divided by the point of contact T, are of lengths '12 cm and 9 cm respectively. If
the area of triangle PQR = 189 sq. cm , then find the lengths of sides PQ and PR
Answer
1
Prakhar
Subject: Maths
, asked on 5/1/18
21.Prove that the intercept of a tangent between a pair of parallel tangents to circle subtend a
right angle at the centre the circle.
Answer
1
Gouri Lahoti
Subject: Maths
, asked on 4/1/18
State weather statement 5 is true or false. Give reason/example
Q.5. If a number of circles passes through the end points P and Q of a line segment PQ, then their centres lie on the perpendicular bisector of PQ.
Answer
1
Gouri Lahoti
Subject: Maths
, asked on 4/1/18
State weather statement 4 is true or false. Give reason/example
Q.4. If a number of circles touch a given line segment PQ at a point A, then their centres lie on the perpendicular bisector of PQ.
Answer
1
Gouri Lahoti
Subject: Maths
, asked on 4/1/18
Its given in answer key that statement 2 is true. How? Give example.
Q.2. The angle between two tangents to a circle may be
0
°
.
Answer
2
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What are you looking for?
Q. In ABC, by Pythagoras Theorem, A
AB2 = AC2 – BC2
AB2 = (AP + PC)2 –BC2
AB2 = (AB + PC)2 –BC2
AB2 = (AB + 8 cm)2 – (16 cm)2
AB = 12 cm
Q18.) Prove that the intercept of a tangent between two parallel tangents to a circle subtends a right angle at the centre.
Q.1. In the given figure, PQ is a chord of a circle with centre O and PT is a tangent. If , find .
Q.1. In the given figure, PQ is a chord of a circle with centre O and PT is a tangent. If , find .
Q. In Figure 5, a triangle PQR is drawn to circumscribe a circle of radius 6 cm such that the segments QT and TR into which QR is divided by the point of contact T, are of lengths '12 cm and 9 cm respectively. If
the area of triangle PQR = 189 sq. cm , then find the lengths of sides PQ and PR
right angle at the centre the circle.
Q.5. If a number of circles passes through the end points P and Q of a line segment PQ, then their centres lie on the perpendicular bisector of PQ.
Q.4. If a number of circles touch a given line segment PQ at a point A, then their centres lie on the perpendicular bisector of PQ.
Q.2. The angle between two tangents to a circle may be .