Estimate the volume of concrete (in cubic yards) needed to place the continuous

Estimate the volume of concrete (in cubic yards) needed to place the continuous footings shown in the figures below. Assume a waste factor of 7%.
The area has six sides and the angle between each set of adjacent sides is 90 degree. The length of the sides in feet are as follows: 22, 20, 8, 25, 30, and 45.
The size of the footing is 2 feet and 6 inches wide by 1 foot thick. The footing has four continuous number 4 rebar and one number 5 dowel spaced at 12 inch apart.
Area with six sides and 90 degree angles between each set of adjacent sides.
Footing with four continuous number 4 rebar and one number 5 dowel spaced at 12 inch apart.