Help me find what angle a is

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

Apark is in the shape of a rectangle. the park authorities are planning to build a 2-meter-wide jogging path in the park (shown as the shaded region in the image). what is the area of the jogging path? plz

Savannah had 40 iris blooms last year this year she had 15% more iris blooms how many more hours blooms did savannah have this year