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if `cos theta = 5/13` where `theta` is an acute angle. Find the value of `sin theta`
Concept: undefined >> undefined
Show that `sqrt((1+cosA)/(1-cosA)) = cosec A + cot A`
Concept: undefined >> undefined
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Prove that, in a right-angled triangle, the square of the hypotenuse is equal to the sum of the square of remaining two sides.
Concept: undefined >> undefined
Eliminate θ, if
x = 3 cosec θ + 4 cot θ
y = 4 cosec θ – 3 cot θ
Concept: undefined >> undefined
Identify, with reason, if the following is a Pythagorean triplet.
(3, 5, 4)
Concept: undefined >> undefined
Identify, with reason, if the following is a Pythagorean triplet.
(4, 9, 12)
Concept: undefined >> undefined
Identify, with reason, if the following is a Pythagorean triplet.
(5, 12, 13)
Concept: undefined >> undefined
Identify, with reason, if the following is a Pythagorean triplet.
(24, 70, 74)
Concept: undefined >> undefined
Identify, with reason, if the following is a Pythagorean triplet.
(10, 24, 27)
Concept: undefined >> undefined
Identify, with reason, if the following is a Pythagorean triplet.
(11, 60, 61)
Concept: undefined >> undefined
For finding AB and BC with the help of information given in the figure, complete following activity.
AB = BC .......... 
∴ ∠BAC = 
∴ AB = BC =
× AC
=
× `sqrt8`
=
× `2sqrt2`
= 

Concept: undefined >> undefined
Find the side and perimeter of a square whose diagonal is 10 cm.
Concept: undefined >> undefined
In the given figure, ∠DFE = 90°, FG ⊥ ED, If GD = 8, FG = 12, find (1) EG (2) FD and (3) EF

Concept: undefined >> undefined
Find the length diagonal of a rectangle whose length is 35 cm and breadth is 12 cm.
Concept: undefined >> undefined
In the given figure, M is the midpoint of QR. ∠PRQ = 90°. Prove that, PQ2 = 4PM2 – 3PR2.

Concept: undefined >> undefined
Walls of two buildings on either side of a street are parallel to each other. A ladder 5.8 m long is placed on the street such that its top just reaches the window of a building at the height of 4 m. On turning the ladder over to the other side of the street, its top touches the window of the other building at a height 4.2 m. Find the width of the street.
Concept: undefined >> undefined
In ∆PQR, point S is the midpoint of side QR. If PQ = 11, PR = 17, PS = 13, find QR.
Concept: undefined >> undefined
In ∆ABC, AB = 10, AC = 7, BC = 9, then find the length of the median drawn from point C to side AB.
Concept: undefined >> undefined
In the given figure, point T is in the interior of rectangle PQRS, Prove that, TS2 + TQ2 = TP2 + TR2 (As shown in the figure, draw seg AB || side SR and A-T-B)

Concept: undefined >> undefined
Some question and their alternative answer are given. Select the correct alternative.
If a, b, and c are sides of a triangle and a2 + b2 = c2, name the type of triangle.
Concept: undefined >> undefined
