In the following figure, in ΔPQR, seg RS is the bisector of ∠PRQ. If PS = 6, SQ = 8, PR = 15, find QR.
Concept: Similarity of Triangles
In the following figure RP: PK= 3:2, then find the value of A(ΔTRP):A(ΔTPK).
Concept: Properties of Ratios of Areas of Two Triangles
Prove that ‘the opposite angles of a cyclic quadrilateral are supplementary’.
Concept: Cyclic Quadrilateral
If two circles with radii 8 cm and 3 cm, respectively, touch internally, then find the distance between their centers.
Concept: Touching Circles
A person standing on the bank of river observes that the angle of elevation of the top of a tree standing on the opposite bank is 60°. When he moves 40 m away from the bank, he finds the angle of elevation to be 30°. Find the height of the tree and width of the river. `(sqrt 3=1.73)`
Concept: Heights and Distances
Using Euler’s formula, find V if E = 30, F = 12.
Concept: Euler's Formula
Find the diagonal of a square whose side is 10 cm.
Concept: Circumference of a Circle
In Fig. 3, AP and BP are tangents to a circle with centre O, such that AP = 5 cm and ∠APB = 60°. Find the length of chord AB.
Concept: Areas of Sector and Segment of a Circle
A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank which is 10 m in diameter and 2 m deep. If the water flows through the pipe at the rate of 4 km per hour, in how much time will the tank be filled completely?
Concept: Surface Area of a Combination of Solids
In the following figure seg AB ⊥ seg BC, seg DC ⊥ seg BC. If AB = 2 and DC = 3, find `(A(triangleABC))/(A(triangleDCB))`
Concept: Properties of Ratios of Areas of Two Triangles
Prove that the angle bisector of a triangle divides the side opposite to the angle in the ratio of the remaining sides.
Concept: Similarity of Triangles
In the following figure, seg BE ⊥ seg AB and seg BA ⊥ seg AD. If BE = 6 and \[\text{AD} = 9 \text{ find} \frac{A\left( \Delta ABE \right)}{A\left( \Delta BAD \right)} \cdot\]

Concept: Similarity of Triangles
In the given figure, AD is the bisector of the exterior ∠A of ∆ABC. Seg AD intersects the side BC produced in D. Prove that :

Concept: Properties of Ratios of Areas of Two Triangles
ΔABP ~ ΔDEF and A(ΔABP) : A(ΔDEF) = 144:81, then AB : DE = ?
Concept: Similarity of Triangles
In ∆PQR, point S is the midpoint of side QR. If PQ = 11, PR = 17, PS = 13, find QR.
Concept: Right-angled Triangles and Pythagoras Property
Some question and their alternative answer are given.
In a right-angled triangle, if sum of the squares of the sides making right angle is 169 then what is the length of the hypotenuse?
Concept: Apollonius Theorem
In ΔMNP, ∠MNP = 90˚, seg NQ ⊥ seg MP, MQ = 9, QP = 4, find NQ.
Concept: Right-angled Triangles and Pythagoras Property
Prove that “The lengths of the two tangent segments to a circle drawn from an external point are equal.”
Concept: Number of Tangents from a Point on a Circle
If two circles with radii 5 cm and 3 cm respectively touch internally, find the distance between their centres.
Concept: Touching Circles
If two circles with radii 8 cm and 3 cm respectively touch externally, then find the distance between their centres.
Concept: Touching Circles