S No. Topic Video
51 6.5 Q4 ABC is an isosceles triangle right angled at C. Prove that...
52 6.5 Q5 ABC is an isosceles triangle with AC = BC. ......prove that ABC is a right triangle.
53 6.5 Q6 ABC is an equilateral triangle of side 2a. Find each of its altitudes.
54 6.5 Q7 Prove that the sum of the squares of the sides of rhombus is equal to the sum of the squares of its diagonals.
55 6.5 Q8 O is a point in the interior of a triangle ABC, OD perp. to BC, OE perp. to AC and OF perp. to AB, show that.........
56 6.5 Q9 A ladder 10 m long reaches a window 8 m above the ground. Find the distance of the foot of the ladder from base of the wall.
57 6.5 Q10 A guy wire attached to a vertical pole of height 18 m is 24 m long and has a stake attached to the other end. How far from ....
58 6.5 Q11 An aero plane leaves an airport and flies due north at a speed of 1,000 km per hour. At the same time, another aero plane leave...
59 6.5 Q12 Two poles of heights 6 m and 11 m stand on a plane ground. If the distance .....
60 6.5 Q13 D and E are points on the sides CA and CB respectively of a triangle ABC right angled........
Topic/Video

51 6.5 Q4 ABC is an isosceles triangle right angled at C. Prove that...

52 6.5 Q5 ABC is an isosceles triangle with AC = BC. ......prove that ABC is a right triangle.

53 6.5 Q6 ABC is an equilateral triangle of side 2a. Find each of its altitudes.

54 6.5 Q7 Prove that the sum of the squares of the sides of rhombus is equal to the sum of the squares of its diagonals.

55 6.5 Q8 O is a point in the interior of a triangle ABC, OD perp. to BC, OE perp. to AC and OF perp. to AB, show that.........

56 6.5 Q9 A ladder 10 m long reaches a window 8 m above the ground. Find the distance of the foot of the ladder from base of the wall.

57 6.5 Q10 A guy wire attached to a vertical pole of height 18 m is 24 m long and has a stake attached to the other end. How far from ....

58 6.5 Q11 An aero plane leaves an airport and flies due north at a speed of 1,000 km per hour. At the same time, another aero plane leave...

59 6.5 Q12 Two poles of heights 6 m and 11 m stand on a plane ground. If the distance .....

60 6.5 Q13 D and E are points on the sides CA and CB respectively of a triangle ABC right angled........

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