Select all of the true statements. * A. π is the area of a circle of diameter 1.
B. π is the area of a circle of radius 1.
C. π is the circumference of a circle of diameter 1.
D. π is the circumference of a circle of radius 1.
E. π is the constant of proportionality relating the radius of a circle to its area.
F. π is the constant of proportionality relating the diameter of a circle to its circumference.

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet