If 5 parallel straight lines are interse...

If 5 parallel straight lines are intersected by 4 parallel straight lines then the number of parallelograms thus formed is

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If m parallel lines in a plane are intersected by a family of n parallel lines, the number of parallelograms that can be formed is a. 1/4m n(m-1)(n-1) b. 1/4m n(m-1) c. 1/4m^2n^2 d. none of these

If n parallel straight line in a plane are intersected by a family of m parallel lines, how many parallelograms are there in the network thus formed?

If n parallel straight lines in a plane are intersected by a family of m parallel lines , how many parallelograms are there in the network thus formed ?

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The number of parallelograms that can be formed from a set of four parallel straight lines intersecting another set of three parallel straight lines is

Two parallel straight lines intersect three concurrent straight lines at the points A , B , C and X,Y,Z respectively. Prove that AB : BC=XY : YZ .

five points are given on one of two parallel straight lines and ten points are given on the other straight line. How many triangles can be formed by taking these points as vertices of a triangle ?

There are 15 points in a plane of which 4 points lie in one stright line and another 5 points lie in another straight line . The two lines are parallel and no three of the remaining 6 points are collinear . Find (a) the number of straight lines and (b) the number of trangles that can be formed by joining the 15 points .

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