Simplify the square of 1whole number 19/81

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∆red ≅ ∆ by rule will give brainiest if possible

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.