Sapling AcademyChange your cover photoUpload Change your cover photoUpload Sapling Academy This user account status is Approved About About Posts Posts Comments Comments 21. In the give figure, AB ǁ DE and AC ǁ DF. Show that Δ ABC ~ Δ DEF. If BC = 10cm, EB = CF = 5 cm and AB =7 cm, then find the length DE. 1 week ago in: triangles no comments 22 a. For acute angles A and B, if sec (2 A – B) = √2 and cosec (A + B) = 2 then find the values of A and B. 1 week ago in: trigonometry no comments 22 b. Evaluate: (2 cos 30 – cot ^3 60)/tan 30 1 week ago in: trigonometry no comments 23. Prove that 4 – 2 √5 is an irrational number given that √5 is irrational. 1 week ago in: real numbers no comments 24. A bag contains 25 balls. Some of them are yellow and others are green. One ball is drawn at random. If probability of getting a green ball is 3/5 then find the number of yellow balls. 1 week ago in: probability no comments 25 a. Vertices of a right triangle ABC with ∠ B = 90 are A (3, 4), B (1, 1) and C (- 8,7) Find the value of tan A. 1 week ago in: coordinate geometry no comments 25 b. Using distance formula, prove that the points A (2, 3), B (- 7, 0) and C (- 1,2) are collinear. 1 week ago in: coordinate geometry no comments 26 a. A circle centered at (2, 1) passes through the points A (5, 6) and B (- 3, K) Find the value of . Hence find length of chord. 1 week ago in: coordinate geometry no comments 26 b. Prove that the point P dividing the line segment joining the points A (- 1, 7) and B (4, – 3) in the ratio 3: 2, lies on the line x – 3y = – 1. Also find length of PA and PB. 1 week ago in: coordinate geometry no comments 27. The dimensions of a window are 156 cm x 216 cm. Arjun wants to put grill on the window creating complete squares of maximum size. Determine the side length of the square and hence find the number of squares formed. 1 week ago in: real numbers no comments load more posts
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