# When two cube of side 12 cm are joined end to end to form a cuboid then find the total surface area of cuboid?

 No worries! We‘ve got your back. Try BYJU‘S free classes today!Right on! Give the BNAT exam to get a 100% scholarship for BYJUS coursesNo worries! We‘ve got your back. Try BYJU‘S free classes today!No worries! We‘ve got your back. Try BYJU‘S free classes today!Open in App Suggest Corrections 8 A metallic right circular cone 20 cm high and whose vertical angle is 60° is cut into two parts at the middle of its height by a plane parallel to its base. If the frustum so obtained be drawn into a wire of diameter , find the length of the wire. In fig. cone ABC is cut out by a plane parallel to the base FG. DEFG is the frustum so obtained. Let O be the centre of the base of the cone and O’ the centre of the base of the frustum.It is given that ∠BAC = 60° ∠OAC = 30°In right triangle AOC, tan And, C =  Height of the frustum = P'O =  volume of the frustum =                                          Radius of the wire = Let h be length of the wire         Volume of wire = From (iii) and (iv), we get