If l+m+n=0, which of the following conditions must l, m and n satisfy so that the system of simultaneous linear equations x+3y-4z=l, 2x-y-z=m, x+y-2z=n has at least one ?
Correct Answer : C
In a triangle ABC, AB=AC, BC=6 cm and BE and CF are the medians drawn to AC and AB respectively. If BE^CF, then find AC (in cm).
In the given figure BC = AC, angle AFD = 40° and CE = CD. The
value of angle BCE = ?
Each side of a given polygon is parallel to either the X or the Y axis. A corner of such a polygon is said to be convex if the internal angle is 90o or concave if the internal angle is 270o. If the number of convex corners in such a polygon is 25, the number of concave corners must be