# Suppose ABCD is a rectangle. Using the RHS theorem, prove that triangles ABC and ADC are congruent.

ABCD is a rectangle

AC is a diagonal

In Δ ABC and Δ ADC

AD = BC (Opposite sides of a rectangle)

ADC = ABC = 900(Angle of a rectangle)

AC = AC (Common side)

So Δ ABC and Δ ADC is congruent by R.H.S. axiom of congruency.

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