There are many possible dimensions which would have a surface area of 15 square metres, from a circle of radius 2.185 metres, a triangle of base 10 and height 3, a square of 3.8729, a rectangle of 5 by 3, and many, many more.
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Entire surface area: (2*pi*36)+(12*pi*15) = 252*pi square units
432 square units.
Total surface area of the cone: (pi*64)+(pi*8*15) = 184*pi or about 578 square units
That would depend on the dimension of the green triage. If the triangle was formed by joining two opposite corners of the parallelogram then it would be half the area of the parallelogram. Area of parallelogram = 15*2 = 30 square cm. 1/2 the area = 15 square cm.
15' x 15' (225 square feet) = 25 square yards.