Present worth from monthly payment with interest rate compunded quarterly

Given the monthly payment for a land loan is 1110. The bank charge 6% interest compunded quarterly for 30 years. What is the price of the land?

*is the concept correct if I first convert 6% to the effective annual rate which it will be 6.14%. Then, dividing it by 12, with the period of 360 (30 x 12).So, the equation will be P=1110(P/A, 0.51%,360). ?

SOLID GEOMETRY: fly stationed at a point on the circumference of the base of a cylindrical tower

a fly stationed at a point on the circumference of the base of a cylindrical tower of radius 12 feet. Find that he can just see a distant flagstaff by walking along the tangent line to the base either a distance 8 feet in one direction or a distance 5 feet in the other direction. Find the distance of the foot of the flagstaff from the center of the base of the tower