Q. 113.7( 3 Votes )

In ΔABC, ∠B = 90° and P is the mid-point of AC. Prove that PB = PA =   AC.

Answer :

In the ΔABC, P is the mid-point of AC and ∠B = 90°. 
To Prove: PA = PB = AC
Construction: Draw PK ïï BC
Proof: Since KP ïï BC with transversal AB
... ∠1 = ∠B = 90°
Also, ∠1 + ∠2 = 180°
... ∠2 = 180° - ∠1 = 180° - 90° = 90°
Now in ΔAPK and ΔBPK,
KP = KP...(common)
∠1 = ∠2...(prove above)
AK = KB...(since KP ïï BC and P is the mid-point of AC)
... ΔAPK ≅ ΔBPK
... PA = PB  but
PA = AC ...( P is the mid-point of AC)
PA = PB = AC.

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