The area of a circle is 80 square inches. find the area of the sector whose central angle is 45 degrees

The whole circle (in terms of area) is 360 degrees. 
Area of Sector = (angle / 360) * Area of the entire circle
Area of Sector = (45 / 360) * 80 in^2
Area of sector = (1/8) * 80 in^2
Area of sector = 10 in^2