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The magnitude of the resultant of two like parallel forces is the sum of the magnitudes of the forces and its direction will be same as the direction of the parallel forces.
2 pairs of 2 parallel lines. An example is the diamond.
A rhombus is 2 pairs of 2 parallel lines. An example is the diamond.
What must be true? In your example, we have 4 intersecting lines. g and b are parallel, and f and h are parallel. g and b are perpendicular to f and h. It might look like tic-tac toe for example
kinda like this.... / \ / \ the lines on the top and bottom are parallel kinda like this.... / \ / \ the lines on the top and bottom are parallel