Question

ABCD is a square. A is joined to point P on BC and D is joined to a point Q on AB. If AP=DQ, prove that AP⊥DQ
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Answer 1

Answer:

Given: A square ABCD with AP = DQ

To prove: AP⊥DQ

Proof:

In Δs ADQ and APB,

∠A=∠B (Angles of a square is always 90°)

AD = AB (sides of a square)

DQ = AP (Given)

⇒ ΔADQ ≅ Δ APB (R.H.S. axiom)

⇒ ∠ADQ = ∠BAP (cpct).....(i)

Now in ΔADQ,

∠DAQ= 90°

⇒ ∠DAP + ∠PAB = 90°

⇒ ∠DAP + ∠ADQ = 90°....(ii)

i.e., ∠DAO +∠ADO =90° (from i)

∴ In Δ AOD,

∠DAO + ∠ADO+∠DOA = 180°

⇒ ∠DOA = 180°-90°

               = 90°

∴ DQ⊥AP (is proved).

Answer 2

Answer:

Refer to the attachment.