How many parallelograms are formed by a set of 4 parallel lines intersecting on other set of 7 parallel lines?
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Let 5 parallel lines p, q, r, s, t intersect 4 parallel lines u, v, w, x.
It can be observed that
12 + 4 + 2 + 1 = 19 parallelograms are formed. (including all small and large ones)
It can be observed that
12 + 4 + 2 + 1 = 19 parallelograms are formed. (including all small and large ones)
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