The Law of Detachment states:
If a ⇒ b is true and a is true, then b is true
if two figures are congruent, their areas are equal.
a = two figures are congruent
b = their areas are equal
We are given b
The area of ABCD equals the area of PQRS.
We cannot use the law of detachment in this case because we need to be given a for the law of detachment to apply.
ABCD could be a rectangle with area 10
PQRS could be a rhombus with area 10
They are not congruent
