Three square regions are joined at their vertices to create the figure shown.

if the area of region z is 169 cm2, which statement is true?
a) the combined area of region x and region y is equal to 169 cm2.
b) the combined area of region x and region y is less than to 169 cm2.
c) the combined area of region x and region y is more than equal to 169 cm2.
d) the combined area of region x and region y cannot be determined from the information presented.