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Mathematics
Properties of Triangle
Previous Years Questions

## MCQ (Single Correct Answer)

For a triangle $$ABC$$, the value of $$\cos 2A + \cos 2B + \cos 2C$$ is least. If its inradius is 3 and incentre is M, then which of the following is ...
A straight line cuts off the intercepts $$\mathrm{OA}=\mathrm{a}$$ and $$\mathrm{OB}=\mathrm{b}$$ on the positive directions of $$x$$-axis and $$y$$ a...
Let PQR be a triangle. The points A, B and C are on the sides QR, RP and PQ respectively such that $${{QA} \over {AR}} = {{RB} \over {BP}} = {{PC} \ov... The angle of elevation of the top of a tower from a point A due north of it is$$\alpha$$and from a point B at a distance of 9 units due west of A is... A horizontal park is in the shape of a triangle$$\mathrm{OAB}$$with$$\mathrm{AB}=16$$. A vertical lamp post$$\mathrm{OP}$$is erected at the point... The angle of elevation of the top P of a vertical tower PQ of height 10 from a point A on the horizontal ground is$$45^{\circ}$$. Let R be a point on... Let a vertical tower$$A B$$of height$$2 h$$stands on a horizontal ground. Let from a point$$P%$$on the ground a man can see upto height$$h$$of... A tower PQ stands on a horizontal ground with base$$Q$$on the ground. The point$$R$$divides the tower in two parts such that$$Q R=15 \mathrm{~m}$... From the base of a pole of height 20 meter, the angle of elevation of the top of a tower is 60$$^\circ$$. The pole subtends an angle 30$$^\circ$$ at t... Let AB and PQ be two vertical poles, 160 m apart from each other. Let C be the middle point of B and Q, which are feet of these two poles. Let $${\pi ... The lengths of the sides of a triangle are 10 + x2, 10 + x2 and 20$$-$$2x2. If for x = k, the area of the triangle is maximum, then 3k2 is equal to ... A vertical pole fixed to the horizontal ground is divided in the ratio 3 : 7 by a mark on it with lower part shorter than the upper part. If the two p... Two poles, AB of length a metres and CD of length a + b (b$$\ne$$a) metres are erected at the same horizontal level with bases at B and D. If BD = x... Let$${{\sin A} \over {\sin B}} = {{\sin (A - C)} \over {\sin (C - B)}}$$, where A, B, C are angles of triangle ABC. If the lengths of the sides oppos... A 10 inches long pencil AB with mid point C and a small eraser P are placed on the horizontal top of a table such that PC =$$\sqrt 5 $$inches and$$... A spherical gas balloon of radius 16 meter subtends an angle 60$$^\circ$$ at the eye of the observer A while the angle of elevation of its center from... Let in a right angled triangle, the smallest angle be $$\theta$$. If a triangle formed by taking the reciprocal of its sides is also a right angled tr... If in a triangle ABC, AB = 5 units, $$\angle B = {\cos ^{ - 1}}\left( {{3 \over 5}} \right)$$ and radius of circumcircle of $$\Delta$$ABC is 5 units, ... A pole stands vertically inside a triangular park ABC. Let the angle of elevation of the top of the pole from each corner of the park be $${\pi \over... The triangle of maximum area that can be inscribed in a given circle of radius 'r' is : A man is observing, from the top of a tower, a boat speeding towards the lower from a certain point A, with uniform speed. At that point, angle of dep... The angle of elevation of a jet plane from a point A on the ground is 60$$^\circ$$. After a flight of 20 seconds at the speed of 432 km/hour, the angl... Two vertical poles are 150 m apart and the height of one is three times that of the other. If from the middle point of the line joining their feet, an... The angle of elevation of the summit of a mountain from a point on the ground is 45°. After climbing up one km towards the summit at an inclination of... The angle of elevation of a cloud C from a point P, 200 m above a still lake is 30°. If the angle of depression of the image of C in the lake from the... A triangle ABC lying in the first quadrant has two vertices as A(1, 2) and B(3, 1). If$$\angle BAC = {90^o}$$and area$$\left( {\Delta ABC} \right) =... The angle of elevation of the top of a vertical tower standing on a horizontal plane is observed to be 45o from a point A on the plane. Let B be the p... The angles A, B and C of a triangle ABC are in A.P. and a : b = 1 : $$\sqrt 3$$. If c = 4 cm, then the area (in sq. cm) of this triangle is : ABC is a triangular park with AB = AC = 100 metres. A vertical tower is situated at the mid-point of BC. If the angles of elevation of the top of the ... Two poles standing on a horizontal ground are of heights 5m and 10 m respectively. The line joining their tops makes an angle of 15º with ground. Then... If the lengths of the sides of a triangle are in A.P. and the greatest angle is double the smallest, then a ratio of lengths of the sides of this tria... Two vertical poles of heights, 20 m and 80 m stand a part on a horizontal plane. The height (in meters) of the point of intersection of the lines join... If the angle of elevation of a cloud from a point P which is 25 m above a lake be 30o and the angle of depression of reflection of the cloud in the la... Given $${{b + c} \over {11}} = {{c + a} \over {12}} = {{a + b} \over {13}}$$ for a $$\Delta$$ABC with usual notation. If $${{\cos A} \ov... In a triangle, the sum of lengths of two sides is x and the product of the lengths of the same two sides is y. If x2 – c2 = y, where c is the length o... With the usual notation, in$$\Delta $$ABC, if$$\angle A + \angle B$$= 120o, a =$$\sqrt 3 +$$1, b =$$\sqrt 3 -$$1 then the ratio$$... Consider a triangular plot ABC with sides AB = 7m, BC = 5m and CA = 6m. A vertical lamp-post at the mid point D of AC subtends an angle 30o at B. The ... A man on the top of a vertical tower observes a car moving at a uniform speed towards the tower on a horizontal road. If it takes 18 min. for the angl... A tower T1 of height 60 m is located exactly opposite to a tower T2 of height 80 m on a straight road. Fromthe top of T1, if the angle of depression o... An aeroplane flying at a constant speed, parallel to the horizontal ground, $$\sqrt 3$$ kmabove it, is obsered at an elevation of $${60^o}$$ from a ... The angle of elevation of the top of a vertical tower from a point A, due east of it is 45o. The angle of elevation of the top of the same tower from ... A man is walking towards a vertical pillar in a straight path, at a uniform speed. At a certain point A on the path, he observes that the angle of ele... If the angles of elevation of the top of a tower from three collinear points $$A, B$$ and $$C,$$ on a line leading to the foot of the tower, are $${30... A bird is sitting on the top of a vertical pole$$20$$m high and its elevation from a point$$O$$on the ground is$${45^ \circ }$$. It files off hor... For a regular polygon, let$$r$$and$$R$$be the radii of the inscribed and the circumscribed circles. A$$false$$statement among the following is$$AB$$is a vertical pole with$$B$$at the ground level and$$A$$at the top.$$A$$man finds that the angle of elevation of the point$$A$$from a c... A tower stands at the centre of a circular park.$$A$$and$$B$$are two points on the boundary of the park such that$$AB(=a)$$subtends an angle of ... If in a$$\Delta ABC$$, the altitudes from the vertices$$A, B, C$$on opposite sides are in H.P, then$$\sin A,\sin B,\sin C$$are in In a triangle$$ABC$$, let$$\angle C = {\pi \over 2}$$. If$$r$$is the inradius and$$R$$is the circumradius of the triangle$$ABC$$, then$$2(r+R... A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is $${60^ \circ }... The sides of a triangle are$$\sin \alpha ,\,\cos \alpha $$and$$\sqrt {1 + \sin \alpha \cos \alpha } $$for some$$0 < \alpha < {\pi \over 2... The sum of the radii of inscribed and circumscribed circles for an $$n$$ sided regular polygon of side $$a,$$ is In a triangle $$ABC$$, medians $$AD$$ and $$BE$$ are drawn. If $$AD=4$$, $$\angle DAB = {\pi \over 6}$$ and $$\angle ABE = {\pi \over 3}$$, then th... If in a $$\Delta ABC$$ $$a\,{\cos ^2}\left( {{C \over 2}} \right) + c\,{\cos ^2}\left( {{A \over 2}} \right) = {{3b} \over 2},$$ then the sides $$a, b... The sides of a triangle are$$3x + 4y,4x + 3y$$and$$5x + 5y$$where$$x$$,$$y>0$$then the triangle is In a triangle with sides$$a, b, c,{r_1} > {r_2} > {r_3}$$(which are the ex-radii) then ## Numerical If a rectangle is inscribed in an equilateral triangle of side length$$2\sqrt 2 $$as shown in the figure, then the square of the largest area of suc... In$$\Delta$$ABC, the lengths of sides AC and AB are 12 cm and 5 cm, respectively. If the area of$$\Delta$\$ABC is 30 cm2 and R and r are respectively...
Let ABCD be a square of side of unit length. Let a circle C1 centered at A with unit radius is drawn. Another circle C2 which touches C1 and the lines...
The angle of elevation of the top of a hill from a point on the horizontal plane passing through the foot of the hill is found to be 45o. After walkin...
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