Quadrilaterals WXYZ and BADC are congruent. In addition, WX―≅DC― and XY―≅BC―. If AD is equal to 4 cm and AB is equal to 6 cm, what is the perimeter of WXYZ ?

Since WXYZ is congruent to BADC in that order, WX corresponds to BA and XY corresponds to AD. Thus WX = 6 cm and XY = 4 cm. The given equalities make the other two sides, YZ and ZW, equal to 6 cm and 4 cm, respectively. The perimeter is 6 + 4 + 6 + 4 = 20 cm, so the correct choice is 20 cm.

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