19. area = area of two semi circles + area of rectangle

= (3.14 * 3 * 3) + 9*6

= 82.26 m^2 or 6813/50 m^2

20. volume of a right solid is given as

volume = area of base * height

therefore

volume = 82.26 * 8

volume = 1090.08 m^3

Feel free to ask any doubts...

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