
Equation of tangent at (x1,y1) is yy1=2a(x+x1)
Equation of normal at (x1,y1) is y−y1=−2ay1(x−x1)
Here tangent and normal passes through P(16,16)
∴ Equation of tangent is 2y=x+16
Equation of normal is y+2x=48
Tangent and normal intersect x-axis at A(−16,0) and B(24,0)
Since, APB is a right angled triangle, hence AB is the diameter for the circle.
Also mid point of AB is center of the circle.
Hence Centre =(4,0)
Slope of PC =34
Slope of PB=−2
tanθ=∣1−2×3434+2∣=∣−510∣=2