Forces along a single plain(Q4)

Today i use to explain it in english coz of some inconvenience with sinhala fonts,anyway i determined  considering this question most of the student had some issues to understand the term 'formed line' it was nothing else when we form a cylinder with a rectangle theres a connection line we use to paste two edges together .so along this form lines A and B cylinders with given measurements then another C cylinder also was given .AB are on C where A touches horizontal  floor.as explained figure was sketched out fairly. All students need to know that you wanna avoid from sketching out special cases. Always try to pay attention on all data you are give then sketch out them with slants fairly .others can be predicted with your knowledge of geometry or calculations based on plane trigonometry .the line which connects A and B is not horizontal .if it doesnt make sense please pay attention on basic trigonometric calculations with projections. Its better to consider M around A considering compound body AB .thats a separated body no more .even theres no reactions between AB so far.If you have any doubt so far please be kind enough to put them here.other questions also may be solved as soon as possible .thank you