20.5, because if we multiply the quarter circle area by 4, we get 50.24. the radius of a circle with the area 50.24 is 4. we can use 4, as both sides of the quarter circle. then we must find the circumference, using a circumference calculator. if the circumference is 25.5, we must divide this by 4, to get the arc. then we add this all together, 4+4+12.5
