A committee has decided to celebrate Durga Puja in a circular Park of radius 35 m the committee has given the contract to a tent house to set up the 10th the architect has designed convey stand in the shape of a semi cylindrical roof surmounted on an open cuboidal shape as shown in the figure the dimensions of the rectangular base is 15 m into 21 m and the total height of the tent is 19 MB the above information answer the following questions the height of the part of the tent is