In a plane, if n number.of parallel lines intersect the P numbers of parallel' lines then how many parallelogram are formed?

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

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 ?

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 10 parallel lines in a plane are intersected by a family of another 8 parallel lines how many parallelograms are there in the network thus formed ?

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

l and m are two parallel lines intersected by another pair of parallel lines p and q . Show that DeltaABC~= DeltaCDA .

Consider the equation y-y_1=m(x-x_1) . If ma n dx_1 are fixed and different lines are drawn for different values of y_1, then (a) the lines will pass through a fixed point (b) there will be a set of parallel lines (c) all the lines intersect the line x=x_1 (d)all the lines will be parallel to the line y=x_1

out of 18 points in a plane no three are in the same straight lines except five points which are collinear how many triangles can be formed by joining them?

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 ?

out of 18 points in a plane no three are in the same straight lines except five points which are collinear how many straight lines can be formed by joining them?