Question

If H ≡ (3, 4) and C ≡ (1, 2) are orthocentre and circumcentre of ΔPQR and equation of side PQ is x – y + 7 = 0, then 

(A) equation of circum circle (x – 1)² + (y – 2)² = 80 

(B) equation of circum circle (x – 1)² + (y – 2)² = 70 

(C) centroid is (5/3,3/8)

(D) circumradius = √70

Answer 1

Correct option (A,C)

Explanation: 

Image of orthocentre lies on circum circle. Let A be image of H in PQ, which is obtained from