Find the area of the circle leave your answer in terms of pi

Remember that the diameter is the entire distance from one edge to another one straight across (It has to pass through the center point of the circle!). Half of the diameter is the radius. 

r = d/2 

Where, r is the radius, and d is the diameter. 

The  Area of a Circle can be found using this formula: 
A = πr^2

r = 1.7/2

A = π*(1.7/2)^2
A = π * (1.7*1.7)/(2*2)
A = π * 2.89 / 4 

A = 0.7225π

I'm sure the answer is a