Find the best method of the ncert class 10 chapter surface areas and volumes . In exercise 13.1 question number 3 is very tricky question i don’t understand the formula of this question please help me put the formula into the question also give the best solution of the question. A toy is in the form of a cone of radius 3.5 cm mounted on a hemisphere of same radius. The total height of the toy is 15.5 cm. Find the total surface area of the toy.