HD4

Let ABC be an acute angled triangle whose orthocentre is at H. If altitude from A is produced to meet the circumcircle of triangle ABC at D, then prove HD=4R cos B cos C

Directions: Study the following information carefully and answer the question given below: A, B, C, D, E, F, G and H are sitting around a circle facing the centre. B is third to the right of F and third to the left of H. C is fourth to the left of A, who is not an immediate neighbour of F or B. E is not an immediate neighbour of B. G is second to the right of D. Which of the following pairs represents the immediate neighbours of F? In which of the following pairs is the first person sitting to the immediate right of the second person? 1) CH 2) ED 3) HD 4) CE 5) None of these

HD2687 is the variety of wheat.

HD-1553 is the variety of

The salt of which one of the follwing five weak acid will be the most hydrolysed? a. HA : K_(a) = 1 xx 10^(-8) b. HB : K_(a) = 2 xx 10^(-6) c. HC : K_(a) = 3 xx 10^(-8) d. HD: K_(a) = 4 xx 10^(-10) e. HE : K_(a) = 1 xx 10^(-7)

Who prepared the H.D. report in India ? What are its units of analysis ?

In,the given figure,if BD=DC,BE=ED,AH= HD and DF Il CG.Find the value of ( areaof /_FEG)/(areaof/_ABC)

In the diagram AD = DB and AH = HD Find the ratio of the area of the shaded portion to that of the triangle DEF, if DE || BC and HG || AE