Question
1. two triangular walls of a flyover have been used for an advertisement from both side the sides of each walls are 120 m 110 m and 20 m the advertisement yeild an earning of rs 100 sq m per year find the revenue in 1 year .
Show that the diagonal of the rectangle divide it into four triangle of equal area.
The area of the triangle formed by O (0, 0), A (4, 1) and B (–2, –5) such that the lenght of the perpendicular from origin to AB is 
units, is
the marks obtained by 10 students in an examination were as follow:70,65,68,70,75,73,80,70,83,86.Find mean deviation about the mean.
