self Maths Puzzle

the ends of a frustum of a piramid are squares on sides of 20cm and 4cm ;if its frustum is 15cm in thickness,find its slant surface area.

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self Other Question
the diameter of the garden roller is 1.4m and it is 2m long.how much area will it cover in 50 revolutions 5, 24, 48, 72, 312, ____,168