Question 590505
the circumference of the cone is 3/4 the circumference of the original circle, so the radius will also be 3/4 of the circle radius


circumference of circle ___ c = 2 * pi * r ___ 2 * pi * 15 ___ 30 pi


circumference of cone is 3/4 of circle ___ (3/4) * 30 pi ___ 22.5 pi


radius of cone ___ r = c / (2 pi) ___ 22.5 pi / 2 pi ___ 11.25