Tent as a cylinder surmounted by a cone: canvas or capacity

This type of question, asked 2 times: CDS 2 2016, CDS 2 2017. All 2 questions below, oldest first.

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Question 1 (case study, 3 parts)
CDS 2 2016
For the next three (03) items that follow : A tent of a circus is made of canvas and is in the form of right circular cylinder and right circular cone above it. The height and diameter of the cylindrical part of the tent are 5 m and 126 m respectively. The total height of the tent is 21 m.
64 $What is the slant height of the cone ?$
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65 $What is the curved surface area of the cylinder ?$
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66 $How many square metres of canvas are used ?$
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Question 2
CDS 2 2017
75 $A tent has been constructed which is in the form of a right circular cylinder surmounted by a right circular cone whose axis coincides with the axis of the cylinder. If the radius of the base of the cylinder is 50 m, the height of the cylinder is 10 m and the total height of the tent is 15 m, then what is the capacity of the tent in cubic metres ?$
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Question 1 (case study, 3 parts)